Add automatic Nicotine+ version checking and building

- Workflow checks PyPI hourly for new Nicotine+ versions
- Automatically builds and pushes new images when updates are available
- Creates Gitea releases tagged with Nicotine+ version
- Supports manual trigger and push events

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -5,9 +5,44 @@ on:
     branches:
       - main
   workflow_dispatch:
+  schedule:
+    - cron: '0 * * * *'  # Every hour
 
 jobs:
+  check-version:
+    runs-on: ubuntu-latest
+    outputs:
+      should_build: ${{ steps.compare.outputs.should_build }}
+      latest_version: ${{ steps.get_version.outputs.version }}
+    steps:
+      - name: Get latest Nicotine+ version from PyPI
+        id: get_version
+        run: |
+          VERSION=$(curl -s https://pypi.org/pypi/nicotine-plus/json | jq -r '.info.version')
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "Latest Nicotine+ version: $VERSION"
+
+      - name: Get current built version
+        id: current_version
+        run: |
+          CURRENT=$(curl -s https://git.nicola.sh/api/v1/repos/public/nicotine-less/releases/latest 2>/dev/null | jq -r '.tag_name // "none"')
+          echo "current=$CURRENT" >> $GITHUB_OUTPUT
+          echo "Current built version: $CURRENT"
+
+      - name: Compare versions
+        id: compare
+        run: |
+          if [ "${{ steps.get_version.outputs.version }}" != "${{ steps.current_version.outputs.current }}" ]; then
+            echo "should_build=true" >> $GITHUB_OUTPUT
+            echo "New version detected, will build"
+          else
+            echo "should_build=false" >> $GITHUB_OUTPUT
+            echo "Already up to date"
+          fi
+
   build:
+    needs: check-version
+    if: needs.check-version.outputs.should_build == 'true' || github.event_name == 'push' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
@@ -31,6 +66,18 @@ jobs:
           push: true
           tags: |
             git.nicola.sh/public/nicotine-less:latest
-            git.nicola.sh/public/nicotine-less:${{ github.sha }}
+            git.nicola.sh/public/nicotine-less:${{ needs.check-version.outputs.latest_version }}
           cache-from: type=registry,ref=git.nicola.sh/public/nicotine-less:buildcache
           cache-to: type=registry,ref=git.nicola.sh/public/nicotine-less:buildcache,mode=max
+
+      - name: Create release
+        if: needs.check-version.outputs.should_build == 'true'
+        run: |
+          curl -X POST "https://git.nicola.sh/api/v1/repos/public/nicotine-less/releases" \
+            -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+            -H "Content-Type: application/json" \
+            -d "{
+              \"tag_name\": \"${{ needs.check-version.outputs.latest_version }}\",
+              \"name\": \"Nicotine+ ${{ needs.check-version.outputs.latest_version }}\",
+              \"body\": \"Automated build with Nicotine+ version ${{ needs.check-version.outputs.latest_version }}\"
+            }"