ci: remove external action dependencies in Forgejo workflow

Replace setup-java, write-file-action, and setup-gradle action steps with shell-based equivalents for reliable Forgejo execution.

.forgejo/workflows/build_release.yml

@@ -23,24 +23,33 @@ jobs:
           fetch-depth: 0
 
       - name: Set up JDK
-        uses: actions/setup-java@v4 # Forgejo-compatible (node20)
-        with:
-          java-version: 17
-          distribution: temurin
+        shell: bash
+        run: |
+          set -euo pipefail
+          if command -v java >/dev/null 2>&1; then
+            java -version
+          else
+            apt-get update
+            apt-get install -y openjdk-17-jdk
+            java -version
+          fi
 
       - name: Write google-services.json
-        uses: DamianReeves/write-file-action@6929a9a6d1807689191dcc8bbe62b54d70a32b42 # v1.3
-        with:
-          path: app/google-services.json
-          contents: ${{ secrets.GOOGLE_SERVICES_JSON }}
-          write-mode: overwrite
+        shell: bash
+        run: |
+          set -euo pipefail
+          cat > app/google-services.json <<'EOF'
+          ${{ secrets.GOOGLE_SERVICES_JSON }}
+          EOF
 
       - name: Write client_secrets.json
-        uses: DamianReeves/write-file-action@6929a9a6d1807689191dcc8bbe62b54d70a32b42 # v1.3
-        with:
-          path: app/src/main/assets/client_secrets.json
-          contents: ${{ secrets.GOOGLE_CLIENT_SECRETS_JSON }}
-          write-mode: overwrite
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p app/src/main/assets
+          cat > app/src/main/assets/client_secrets.json <<'EOF'
+          ${{ secrets.GOOGLE_CLIENT_SECRETS_JSON }}
+          EOF
 
       - name: Prepare release metadata
         id: prepare
@@ -67,7 +76,11 @@ jobs:
           } >> "$GITHUB_OUTPUT"
 
       - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@v4.4.2 # Forgejo-compatible (node20)
+        shell: bash
+        run: |
+          set -euo pipefail
+          chmod +x ./gradlew
+          ./gradlew --version
 
       - name: Check code format
         run: ./gradlew spotlessCheck