Cache NuGet and RobustToolbox outputs

.github/workflows/publish.yml

@@ -14,6 +14,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      CDN_MANIFEST_URL: https://cdn.wylab.me/fork/wylab/manifest
     steps:
     - name: Fail if we are attempting to run on the master branch
       if: ${{GITHUB.REF_NAME == 'master' && github.repository == 'space-wizards/space-station-14'}}
@@ -26,6 +28,41 @@ jobs:
       with:
         submodules: 'recursive'
 
+    - name: Check if build already published
+      id: cdn-check
+      run: |
+        set -euo pipefail
+        python3 - <<'PY'
+import json, os, urllib.request, sys
+url = os.environ["CDN_MANIFEST_URL"]
+sha = os.environ["GITHUB_SHA"].lower()
+with urllib.request.urlopen(url) as resp:
+    manifest = json.load(resp)
+exists = sha in manifest.get("builds", {})
+with open(os.environ["GITHUB_OUTPUT"], "a", encoding="utf-8") as f:
+    f.write(f"skip={'true' if exists else 'false'}\n")
+if exists:
+    print(f"Build {sha} already present on CDN; skipping packaging.")
+else:
+        print(f"Build {sha} not found on CDN; continuing.")
+PY
+
+    - name: Cache NuGet packages
+      uses: actions/cache@v4
+      with:
+        path: ~/.nuget/packages
+        key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj', 'global.json') }}
+        restore-keys: |
+          ${{ runner.os }}-nuget-
+
+    - name: Cache RobustToolbox build output
+      uses: actions/cache@v4
+      with:
+        path: RobustToolbox/bin
+        key: ${{ runner.os }}-robust-${{ hashFiles('RobustToolbox/**/*.csproj', 'global.json') }}
+        restore-keys: |
+          ${{ runner.os }}-robust-
+
     # Corvax-Secrets-Start
     - name: Setup secrets
       env:
@@ -51,23 +88,29 @@ jobs:
       uses: actions/setup-dotnet@v4.1.0
       with:
         dotnet-version: 9.0.x
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Get Engine Tag
       run: |
         cd RobustToolbox
         git fetch --depth=1
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Install dependencies
       run: dotnet restore
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Build Packaging
       run: dotnet build Content.Packaging --configuration Release --no-restore /m
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Package server
       run: dotnet run --project Content.Packaging server --platform win-x64 --platform win-arm64 --platform linux-x64 --platform linux-arm64 --platform osx-x64 --platform osx-arm64
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Package client
       run: dotnet run --project Content.Packaging client --no-wipe-release
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Publish version
       run: Tools/publish_multi_request.py
@@ -75,9 +118,10 @@ jobs:
         PUBLISH_TOKEN: ${{ secrets.PUBLISH_TOKEN }}
         GITHUB_REPOSITORY: wylab/wylab-station-14
         FORK_ID: wylab
+      if: ${{ steps.cdn-check.outputs.skip != 'true' }}
 
     - name: Trigger Docker image rebuild
-      if: ${{ success() }}
+      if: ${{ success() && steps.cdn-check.outputs.skip != 'true' }}
       env:
         DISPATCH_TOKEN: ${{ secrets.DOCKER_TRIGGER_TOKEN }}
         TARGET_REPO: wylab/WS14-Docker-Linux-Server