M7: add PdfForge CI

.github/workflows/pdfforge-ci.yml

@@ -0,0 +1,72 @@
+name: PdfForge CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+    types: [opened, synchronize, reopened, ready_for_review]
+  workflow_dispatch:
+
+concurrency:
+  group: pdfforge-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  changes:
+    name: Detect PdfForge changes
+    runs-on: ubuntu-latest
+    outputs:
+      pdfforge: ${{ steps.filter.outputs.pdfforge }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref || github.ref }}
+
+      - uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            pdfforge:
+              - 'PdfForge/**'
+              - 'gradle/**'
+              - 'gradlew'
+              - 'gradlew.bat'
+              - 'gradle.properties'
+              - 'settings.gradle*'
+              - 'build.gradle*'
+              - 'gradle/libs.versions.toml'
+              - '.github/workflows/**'
+
+  build:
+    name: Build & Test
+    needs: [changes]
+    if: github.event_name == 'workflow_dispatch' || needs.changes.outputs.pdfforge == 'true'
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: PdfForge
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref || github.ref }}
+
+      - name: Setup Java 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+
+      - name: Gradle build cache
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Build
+        run: ./gradlew build