[ci] Add GitHub Actions CI and release workflows

CI workflow: builds XAR on push/PR using exist-core extracted from
Docker image (workaround for stale published SNAPSHOT artifacts).

Release workflow: creates GitHub release with XAR artifact on tag push.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: joewiz

.github/workflows/ci.yml

@@ -0,0 +1,69 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'zulu'
+
+      - name: Extract exist-core JARs from Docker image
+        run: |
+          # Pull the latest eXist-db Docker image and extract the uber JAR
+          docker pull existdb/existdb:latest
+          CONTAINER_ID=$(docker create existdb/existdb:latest)
+
+          # Extract exist-core JAR and install into local Maven repo
+          docker cp "$CONTAINER_ID:/exist/lib/exist-core-7.0.0-SNAPSHOT.jar" exist-core.jar
+          docker cp "$CONTAINER_ID:/exist/lib/exist-start-7.0.0-SNAPSHOT.jar" exist-start.jar
+
+          # Install into local Maven repo so the build can find them
+          mvn install:install-file \
+            -Dfile=exist-core.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-core \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+
+          mvn install:install-file \
+            -Dfile=exist-start.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-start \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+
+          # Create a test-jar (empty placeholder for compilation)
+          jar cf exist-core-tests.jar -C /dev/null . 2>/dev/null || touch exist-core-tests.jar
+          mvn install:install-file \
+            -Dfile=exist-core-tests.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-core \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=test-jar \
+            -DgeneratePom=false \
+            -Dclassifier=tests
+
+          docker rm "$CONTAINER_ID"
+
+      - name: Build XAR (compile + package, skip tests)
+        run: mvn package -DskipTests
+
+      - name: Upload XAR artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: exist-request-xar
+          path: target/exist-request-*.xar

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'zulu'
+
+      - name: Extract exist-core JARs from Docker image
+        run: |
+          docker pull existdb/existdb:latest
+          CONTAINER_ID=$(docker create existdb/existdb:latest)
+          docker cp "$CONTAINER_ID:/exist/lib/exist-core-7.0.0-SNAPSHOT.jar" exist-core.jar
+          docker cp "$CONTAINER_ID:/exist/lib/exist-start-7.0.0-SNAPSHOT.jar" exist-start.jar
+          mvn install:install-file \
+            -Dfile=exist-core.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-core \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+          mvn install:install-file \
+            -Dfile=exist-start.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-start \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+          docker rm "$CONTAINER_ID"
+
+      - name: Build XAR
+        run: mvn package -DskipTests
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: target/exist-request-*.xar
+          generate_release_notes: true