build: process for automatic release tags (#10133)

Make the release tagging consistent. Push to release branch to create a
stable release; push to release-rc to release a new candidate.

.github/workflows/build-syncthing.yaml

@@ -173,7 +173,7 @@ jobs:
 
   codesign-windows:
     name: Codesign for Windows
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-') || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
     environment: release
     runs-on: windows-latest
     needs:
@@ -280,7 +280,7 @@ jobs:
 
   package-macos:
     name: Package for macOS
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-') || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
     environment: release
     runs-on: macos-latest
     steps:
@@ -380,7 +380,7 @@ jobs:
 
   notarize-macos:
     name: Notarize for macOS
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-') || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
     environment: release
     needs:
       - package-macos
@@ -524,7 +524,7 @@ jobs:
 
   sign-for-upgrade:
     name: Sign for upgrade
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-')  || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
     environment: release
     needs:
       - codesign-windows
@@ -723,6 +723,8 @@ jobs:
     name: Publish release files
     if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/tags/v'))
     environment: release
+    permissions:
+      contents: write
     needs:
       - sign-for-upgrade
       - package-debian
@@ -782,13 +784,35 @@ jobs:
         with:
           args: sync -v objstore:release/${{ env.VERSION }} objstore:release/latest
 
+      - name: Create GitHub release and push binaries
+        run: |
+          maybePrerelease=""
+          if [[ $VERSION == *-* ]]; then
+            maybePrerelease="--prerelease"
+          fi
+          export GH_PROMPT_DISABLED=1
+          if ! gh release view --json name "$VERSION" >/dev/null 2>&1 ; then
+            gh release create \
+              "$VERSION" \
+              $maybePrerelease \
+              --title "$VERSION" \
+              --notes-from-tag
+          fi
+          gh release upload "$VERSION" \
+            packages/*.asc packages/*.json \
+            packages/syncthing-*.tar.gz \
+            packages/syncthing-*.zip \
+            packages/syncthing*.deb
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   #
   # Push Debian/APT archive
   #
 
   publish-apt:
     name: Publish APT
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-') || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
     environment: release
     needs:
       - package-debian
@@ -867,7 +891,7 @@ jobs:
   docker-syncthing:
     name: Build and push Docker images
     runs-on: ubuntu-latest
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/release' || github.ref == 'refs/heads/infrastructure' || startsWith(github.ref, 'refs/heads/release-') || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/release-nightly' || github.ref == 'refs/heads/infrastructure' || startsWith(github.ref, 'refs/tags/v'))
     environment: docker
     permissions:
       contents: read

.github/workflows/release-syncthing.yaml

@@ -0,0 +1,55 @@
+name: Release Syncthing
+
+on:
+  push:
+    branches:
+      - release
+      - release-rc*
+
+permissions:
+  contents: write
+
+jobs:
+  create-release-tag:
+    name: Create release tag
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: stable
+
+      - name: Get svu
+        run: |
+          go install github.com/caarlos0/svu@latest
+
+      - name: Determine version to release
+        run: |
+          if [[ "$GITHUB_REF_NAME" == "release" ]] ; then
+            next=$(svu next)
+          else
+            next=$(svu prerelease --pre-release rc)
+          fi
+          echo "NEXT=$next" >> $GITHUB_ENV
+          echo "Next version is $next"
+
+          prev=$(git describe --exclude "*-*" --abbrev=0)
+          echo "PREV=$prev" >> $GITHUB_ENV
+          echo "Previous version is $prev"
+
+      - name: Determine release notes
+        run: |
+          go run ./script/relnotes.go --new-ver "$NEXT" --branch "$GITHUB_REF_NAME" --prev-ver "$PREV" > notes.md
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create and push tag
+        run: |
+          git config --global user.name 'Syncthing Release Automation'
+          git config --global user.email 'release@syncthing.net'
+          git tag -a -F notes.md "$NEXT"
+          git push origin "$NEXT"