Rewrite CI from scratch: clean build + scheduled update, remove deb workflow

.github/workflows/scheduled-update.yaml

@@ -1,4 +1,4 @@
-name: scheduled version check
+name: Check for new upstream release
 
 on:
   schedule:
@@ -10,156 +10,70 @@ permissions:
   security-events: write
 
 env:
-  GHCR_REPO: ghcr.io/trent-maetzold/protonmail-bridge
+  IMAGE: ghcr.io/${{ github.repository_owner }}/protonmail-bridge
 
 jobs:
   check:
     runs-on: ubuntu-latest
     outputs:
       version: ${{ steps.check.outputs.version }}
-      build_needed: ${{ steps.check.outputs.build_needed }}
+      needed: ${{ steps.check.outputs.needed }}
     steps:
-      - name: Check for new upstream version
+      - name: Compare upstream to registry
         id: check
         run: |
-          latest=$(curl -s https://api.github.com/repos/ProtonMail/proton-bridge/releases/latest | jq -r '.tag_name')
-          echo "Latest upstream: $latest"
-          echo "version=$latest" >> $GITHUB_OUTPUT
+          version=$(curl -s https://api.github.com/repos/ProtonMail/proton-bridge/releases/latest | jq -r '.tag_name')
+          echo "version=$version" >> $GITHUB_OUTPUT
 
-          token=$(curl -s "https://ghcr.io/token?scope=repository:trent-maetzold/protonmail-bridge:pull" | jq -r '.token')
-          tags=$(curl -s -H "Authorization: Bearer $token" "https://ghcr.io/v2/trent-maetzold/protonmail-bridge/tags/list" | jq -r '.tags[]?' 2>/dev/null || echo "")
+          token=$(curl -s "https://ghcr.io/token?scope=repository:${{ github.repository_owner }}/protonmail-bridge:pull" | jq -r '.token')
+          exists=$(curl -s -o /dev/null -w '%{http_code}' \
+            -H "Authorization: Bearer $token" \
+            "https://ghcr.io/v2/${{ github.repository_owner }}/protonmail-bridge/manifests/$version")
 
-          if echo "$tags" | grep -qx "${latest}-build"; then
-            echo "Version ${latest} already built"
-            echo "build_needed=false" >> $GITHUB_OUTPUT
+          if [ "$exists" = "200" ]; then
+            echo "needed=false" >> $GITHUB_OUTPUT
+            echo "$version already exists in registry"
           else
-            echo "New version ${latest} detected"
-            echo "build_needed=true" >> $GITHUB_OUTPUT
+            echo "needed=true" >> $GITHUB_OUTPUT
+            echo "New version $version — building"
           fi
 
   build:
     needs: check
-    if: needs.check.outputs.build_needed == 'true'
-    strategy:
-      fail-fast: false
-      matrix:
-        platform:
-          - linux/amd64
-          - linux/arm64/v8
-          - linux/arm/v7
-          - linux/riscv64
+    if: needs.check.outputs.needed == 'true'
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+      - uses: actions/checkout@v4
 
-      - name: Prepare
-        run: |
-          platform=${{ matrix.platform }}
-          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+      - uses: docker/setup-buildx-action@v3
 
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.GHCR_REPO }}
-
-      - name: Login to GHCR
-        uses: docker/login-action@v3
+      - uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Build and push by digest
-        id: build
+      - name: Build and push
         uses: docker/build-push-action@v6
         with:
-          platforms: ${{ matrix.platform }}
-          labels: ${{ steps.meta.outputs.labels }}
-          outputs: type=image,"name=${{ env.GHCR_REPO }}",push-by-digest=true,name-canonical=true,push=true
           context: ./build
-          file: ./build/Dockerfile
-          provenance: false
-          sbom: false
+          push: true
+          tags: |
+            ${{ env.IMAGE }}:latest
+            ${{ env.IMAGE }}:${{ needs.check.outputs.version }}
           build-args: |
             version=${{ needs.check.outputs.version }}
 
-      - name: Export digest
-        run: |
-          mkdir -p ${{ runner.temp }}/digests
-          digest="${{ steps.build.outputs.digest }}"
-          touch "${{ runner.temp }}/digests/${digest#sha256:}"
-
-      - name: Upload digest
-        uses: actions/upload-artifact@v4
-        with:
-          name: digests-${{ env.PLATFORM_PAIR }}
-          path: ${{ runner.temp }}/digests/*
-          if-no-files-found: error
-          retention-days: 1
-
-  merge:
-    runs-on: ubuntu-latest
-    needs:
-      - check
-      - build
-    steps:
-      - name: Download digests
-        uses: actions/download-artifact@v4
-        with:
-          path: ${{ runner.temp }}/digests
-          pattern: digests-*
-          merge-multiple: true
-
-      - name: Login to GHCR
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          driver-opts: network=host
-
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.GHCR_REPO }}
-          tags: |
-            type=raw,enable=true,value=${{ needs.check.outputs.version }}-build
-            type=raw,enable=true,value=build
-            type=raw,enable=true,value=latest
-
-      - name: Create manifest list and push
-        working-directory: ${{ runner.temp }}/digests
-        run: |
-          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
-            $(printf '${{ env.GHCR_REPO }}@sha256:%s ' *)
-
-      - name: Run Trivy vulnerability scan
+      - name: Trivy scan
         uses: aquasecurity/trivy-action@0.30.0
         with:
-          image-ref: "${{ env.GHCR_REPO }}:${{ needs.check.outputs.version }}-build"
-          format: 'sarif'
-          exit-code: 0
-          severity: 'CRITICAL,HIGH'
-          output: 'trivy-results.sarif'
+          image-ref: ${{ env.IMAGE }}:${{ needs.check.outputs.version }}
+          format: sarif
+          output: trivy-results.sarif
+          severity: CRITICAL,HIGH
 
-      - name: Upload Trivy scan SARIF report
+      - name: Upload Trivy results
         uses: github/codeql-action/upload-sarif@v3
+        if: always()
         with:
-          sarif_file: 'trivy-results.sarif'
-
-      - name: Inspect image
-        run: |
-          docker buildx imagetools inspect ${{ env.GHCR_REPO }}:${{ needs.check.outputs.version }}-build
+          sarif_file: trivy-results.sarif