Skip redundant Docker image builds

.github/workflows/main.yml

@@ -1,48 +1,80 @@
 #
-name: Create and publish a Docker image
+name: Build and publish wylab SS14 server
 
-# Configures this workflow to run every time a change is pushed to the branch called `release`.
+# Build whenever the Docker wrapper changes.
 on:
   push:
     branches: ['main']
+  repository_dispatch:
+    types: ['ss14-package-ready']
+  workflow_dispatch:
 
-# Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
+# Workflow-wide defaults. Adjust IMAGE_NAME/REGISTRY if you are publishing elsewhere.
 env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
+  REGISTRY: git.wylab.me
+  IMAGE_NAME: wylab/WS14-Docker-Linux-Server
+  TARGET_PLATFORM: linux-x64
+  WYLAB_SOURCE_REPO: https://git.wylab.me/wylab/wylab-station-14.git
+  WYLAB_SOURCE_REF: master
 
-# There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
-    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
     permissions:
       contents: read
       packages: write
-      # 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
-      - name: Log in to the Container registry
+
+      - name: Resolve wylab commit
+        id: wylab
+        env:
+          PAYLOAD_COMMIT: ${{ github.event.client_payload.commit }}
+        run: |
+          set -euo pipefail
+          if [ -n "${PAYLOAD_COMMIT}" ]; then
+            COMMIT="${PAYLOAD_COMMIT}"
+          else
+            REF="${WYLAB_SOURCE_REF}"
+            COMMIT=$(git ls-remote "${WYLAB_SOURCE_REPO}" "${REF}" | head -n1 | cut -f1)
+          fi
+          if [ -z "${COMMIT}" ]; then
+            echo "Unable to resolve commit to build." >&2
+            exit 1
+          fi
+          echo "commit=${COMMIT}" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to the container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
-      - name: Extract metadata (tags, labels) for Docker
-        id: meta
-        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
-      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
-      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+          username: ${{ secrets.REGISTRY_USERNAME || github.actor }}
+          password: ${{ secrets.REGISTRY_PASSWORD || secrets.GITHUB_TOKEN }}
+
+      - name: Check for existing image
+        id: image-check
+        env:
+          TARGET_TAG: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.wylab.outputs.commit }}
+        run: |
+          if docker manifest inspect "$TARGET_TAG" >/dev/null 2>&1; then
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+            echo "Image $TARGET_TAG already exists; skipping build."
+          else
+            echo "exists=false" >> "$GITHUB_OUTPUT"
+          fi
+
       - name: Build and push Docker image
+        if: ${{ steps.image-check.outputs.exists != 'true' }}
         uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
         with:
           context: .
           push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.wylab.outputs.commit }}
+          build-args: |
+            SOURCE_REPO=${{ env.WYLAB_SOURCE_REPO }}
+            SOURCE_REF=${{ steps.wylab.outputs.commit }}
+            TARGET_PLATFORM=${{ env.TARGET_PLATFORM }}

README.md

@@ -35,7 +35,7 @@ This project is for those who prefer containerized solutions. It's based on the
       --build-arg SOURCE_REPO=https://git.wylab.me/wylab/wylab-station-14.git \
       --build-arg SOURCE_REF=master \
       --build-arg TARGET_PLATFORM=linux-x64 \
-      -t wylab-ss14-server .
+      -t git.wylab.me/wylab/WS14-Docker-Linux-Server:local .
     ```
 
     - `SOURCE_REPO` – Git URL of the content repo to compile (defaults to the wylab fork).
@@ -54,7 +54,7 @@ docker run -d \
   -p 5000:5000/udp \
   -v /path/on/host:/ss14 \
   --name wylab-ss14 \
-  wylab-ss14-server
+  git.wylab.me/wylab/WS14-Docker-Linux-Server:latest
 ```
 
 On first start the container copies `/ss14-default` into your mounted volume (if empty) so you can edit configs or upload new builds persistently.
@@ -66,8 +66,7 @@ version: '3.9'
 
 services:
   ss14-server:
-    image: wylab-ss14-server
-    build: .
+    image: git.wylab.me/wylab/WS14-Docker-Linux-Server:latest
     ports:
       - "1212:1212/tcp"
       - "1212:1212/udp"
@@ -78,4 +77,37 @@ services:
     restart: unless-stopped
 ```
 
+### CI/CD
+
+Two workflows keep this image up to date:
+
+1. **`wylab-station-14/.github/workflows/publish.yml`**  
+   - Triggered on pushes to `master`, manual dispatch, or nightly cron.  
+   - Checks `https://cdn.wylab.me/fork/wylab/manifest` first; if the current commit already exists on the CDN it exits early.  
+   - Uses `actions/cache` to persist `~/.nuget/packages` and `RobustToolbox/bin`, so repeated builds reuse restored packages/engine binaries when the inputs haven’t changed.  
+   - Otherwise builds the server/client packages via `Content.Packaging`, uploads them via `Tools/publish_multi_request.py`, and fires a `repository_dispatch` event (`event_type: ss14-package-ready`) to this repo.
+
+   Required secrets in the wylab-station-14 repo:  
+   `PUBLISH_TOKEN`, `DOCKER_TRIGGER_TOKEN`, and (if used) `SECRETS_PRIVATE_KEY`.  
+   To send the dispatch, add `DOCKER_TRIGGER_TOKEN` (a PAT with repo access).
+
+2. **`WS14-Docker-Linux-Server/.github/workflows/main.yml`**  
+   - Triggered on pushes here, manual dispatch, or the `ss14-package-ready` event.  
+   - Resolves the target wylab commit (uses the payload commit if provided).  
+   - Logs into `git.wylab.me` and runs `docker manifest inspect` before building; if an image tagged with that commit already exists it skips the build.  
+   - Otherwise builds the Docker image with `SOURCE_REF=<commit>` and pushes:
+     - `git.wylab.me/wylab/WS14-Docker-Linux-Server:latest`
+     - `git.wylab.me/wylab/WS14-Docker-Linux-Server:<docker repo commit>`
+     - `git.wylab.me/wylab/WS14-Docker-Linux-Server:<wylab commit>`
+
+   Required secrets here: `REGISTRY_USERNAME` / `REGISTRY_PASSWORD` (credentials for `git.wylab.me`).
+
+After the build finishes, Unraid (or any host) can pull:
+
+```
+git.wylab.me/wylab/WS14-Docker-Linux-Server:latest
+```
+
+Use that string in Unraid’s “Repository” field and map `/ss14` to persistent storage.
+
 ---