[ci] Add GitHub Actions CI and release workflows

CI builds the XAR on push/PR by extracting exist.uber.jar from the
existdb/existdb Docker image (workaround for stale published SNAPSHOT
artifacts). Release workflow creates a 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 +1,54 @@
+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.uber.jar from Docker image
+        run: |
+          docker pull existdb/existdb:latest
+          CONTAINER_ID=$(docker create existdb/existdb:latest)
+          docker cp "$CONTAINER_ID:/exist/lib/exist.uber.jar" exist.uber.jar
+          docker rm "$CONTAINER_ID"
+
+          # Install uber JAR as exist-core (it contains all exist-core classes)
+          mvn install:install-file \
+            -Dfile=exist.uber.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-core \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+
+          # Also install as exist-start (uber JAR contains start classes too)
+          mvn install:install-file \
+            -Dfile=exist.uber.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-start \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+
+      - 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 +1,52 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+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.uber.jar from Docker image
+        run: |
+          docker pull existdb/existdb:latest
+          CONTAINER_ID=$(docker create existdb/existdb:latest)
+          docker cp "$CONTAINER_ID:/exist/lib/exist.uber.jar" exist.uber.jar
+          docker rm "$CONTAINER_ID"
+          mvn install:install-file \
+            -Dfile=exist.uber.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-core \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+          mvn install:install-file \
+            -Dfile=exist.uber.jar \
+            -DgroupId=org.exist-db \
+            -DartifactId=exist-start \
+            -Dversion=7.0.0-SNAPSHOT \
+            -Dpackaging=jar \
+            -DgeneratePom=true
+
+      - 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