feat(gitea): attach build artifacts to Gitea releases

The Android release workflow now creates or updates a Gitea
release and attaches the APK and its SHA256 to it. A
GITEA_TOKEN with releases: write is required for uploads.
The README now documents the Gitea release flow and the
required permissions.

- Enforces that releases run only on a tag and matches the app version.
- Replaces or updates release assets to match tag names.
- Requires GITEA_TOKEN with releases: write for uploads.

.gitea/workflows/android-release.yml

@@ -11,6 +11,9 @@ jobs:
     name: Build signed release APK
     runs-on: ubuntu-latest
     timeout-minutes: 60
+    permissions:
+      code: read
+      releases: write
     env:
       ANDROID_COMPILE_SDK: "36"
       ANDROID_BUILD_TOOLS: "36.0.0"
@@ -19,6 +22,7 @@ jobs:
       ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
       ANDROID_KEY_ALIAS: ${{ secrets.ANDROID_KEY_ALIAS }}
       ANDROID_KEY_PASSWORD: ${{ secrets.ANDROID_KEY_PASSWORD }}
+      GITEA_RELEASE_TOKEN: ${{ secrets.GITEA_TOKEN }}
 
     steps:
       - name: Check out repository
@@ -64,8 +68,11 @@ jobs:
         run: npm ci
 
       - name: Check release tag and app version
-        if: gitea.ref_type == 'tag'
         run: |
+          if [ "${GITHUB_REF_TYPE}" != "tag" ]; then
+            echo "Release builds must run on a tag such as v0.1.0." >&2
+            exit 1
+          fi
           APP_VERSION="$(node -p "require('./src-tauri/tauri.conf.json').version")"
           if [ "${GITHUB_REF_NAME}" != "v${APP_VERSION}" ]; then
             echo "Tag ${GITHUB_REF_NAME} does not match app version v${APP_VERSION}." >&2
@@ -78,7 +85,8 @@ jobs:
             ANDROID_KEYSTORE_BASE64 \
             ANDROID_KEYSTORE_PASSWORD \
             ANDROID_KEY_ALIAS \
-            ANDROID_KEY_PASSWORD
+            ANDROID_KEY_PASSWORD \
+            GITEA_RELEASE_TOKEN
           do
             if [ -z "${!SECRET_NAME:-}" ]; then
               echo "Missing Gitea Actions secret: ${SECRET_NAME}" >&2
@@ -118,11 +126,73 @@ jobs:
           rm "${ALIGNED_APK}"
           (cd "${RELEASE_DIRECTORY}" && sha256sum WallpaperFlow-release.apk > WallpaperFlow-release.apk.sha256)
 
-      - name: Upload release APK
-        uses: actions/upload-artifact@v3
-        with:
-          name: WallpaperFlow-${{ gitea.ref_name }}-android
-          path: |
-            release/WallpaperFlow-release.apk
+      - name: Attach APK to Gitea release
+        run: |
+          API_ROOT="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}"
+          RELEASE_JSON="${RUNNER_TEMP}/wallpaperflow-release.json"
+          CREATE_JSON="${RUNNER_TEMP}/wallpaperflow-create-release.json"
+          ASSETS_JSON="${RUNNER_TEMP}/wallpaperflow-release-assets.json"
+
+          STATUS="$(curl --silent --show-error \
+            --output "${RELEASE_JSON}" \
+            --write-out '%{http_code}' \
+            --header "Authorization: token ${GITEA_RELEASE_TOKEN}" \
+            "${API_ROOT}/releases/tags/${GITHUB_REF_NAME}")"
+
+          if [ "${STATUS}" = "404" ]; then
+            node -e '
+              process.stdout.write(JSON.stringify({
+                tag_name: process.env.GITHUB_REF_NAME,
+                name: `WallpaperFlow ${process.env.GITHUB_REF_NAME}`,
+                body: "Automatisch erstelltes Android-Release.",
+                draft: false,
+                prerelease: false
+              }))
+            ' > "${CREATE_JSON}"
+            curl --fail --silent --show-error \
+              --request POST \
+              --header "Authorization: token ${GITEA_RELEASE_TOKEN}" \
+              --header "Content-Type: application/json" \
+              --data-binary "@${CREATE_JSON}" \
+              --output "${RELEASE_JSON}" \
+              "${API_ROOT}/releases"
+          elif [ "${STATUS}" != "200" ]; then
+            echo "Could not read Gitea release for ${GITHUB_REF_NAME} (HTTP ${STATUS})." >&2
+            exit 1
+          fi
+
+          RELEASE_ID="$(node -e '
+            const release = JSON.parse(require("fs").readFileSync(process.argv[1], "utf8"));
+            if (!release.id) process.exit(1);
+            process.stdout.write(String(release.id));
+          ' "${RELEASE_JSON}")"
+
+          curl --fail --silent --show-error \
+            --header "Authorization: token ${GITEA_RELEASE_TOKEN}" \
+            --output "${ASSETS_JSON}" \
+            "${API_ROOT}/releases/${RELEASE_ID}/assets"
+
+          for FILE in \
+            release/WallpaperFlow-release.apk \
             release/WallpaperFlow-release.apk.sha256
-          if-no-files-found: error
+          do
+            ASSET_NAME="$(basename "${FILE}")"
+            ASSET_ID="$(ASSET_NAME="${ASSET_NAME}" node -e '
+              const assets = JSON.parse(require("fs").readFileSync(process.argv[1], "utf8"));
+              const asset = assets.find(item => item.name === process.env.ASSET_NAME);
+              if (asset) process.stdout.write(String(asset.id));
+            ' "${ASSETS_JSON}")"
+
+            if [ -n "${ASSET_ID}" ]; then
+              curl --fail --silent --show-error \
+                --request DELETE \
+                --header "Authorization: token ${GITEA_RELEASE_TOKEN}" \
+                "${API_ROOT}/releases/${RELEASE_ID}/assets/${ASSET_ID}"
+            fi
+
+            curl --fail --silent --show-error \
+              --request POST \
+              --header "Authorization: token ${GITEA_RELEASE_TOKEN}" \
+              --form "attachment=@${FILE}" \
+              "${API_ROOT}/releases/${RELEASE_ID}/assets" >/dev/null
+          done