Add GitHub actions

Author: martinbonnin

.github/workflows/build-pull-request.yaml

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+on: pull_request
+
+jobs:
+  build-pull-request:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2
+      - run: |
+          ./gradlew build

.github/workflows/publish-pages.yaml

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+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  publish-pages:
+    runs-on: ubuntu-latest
+    if: github.event.repository.fork == false
+
+    # Required for the `deploy-pages` action
+    permissions:
+      pages: write
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2
+      - run: |
+          export JAVA_HOME=$JAVA_HOME_21_X64 # Remove when ubuntu-latest updates to Java 21
+          ./gradlew librarianStaticContent
+      - uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa #v3.0.1
+        with:
+          path: "build/static"
+      - uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e #v4.0.5

.github/workflows/publish-release.yaml

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+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  publish-release:
+    runs-on: ubuntu-latest
+    if: github.event.repository.fork == false
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2
+      - run: |
+          LIBRARIAN_RELEASE=true ./gradlew librarianPublishToMavenCentral
+        env:
+          LIBRARIAN_SONATYPE_PASSWORD: ${{ secrets.CENTRAL_PORTAL_PASSWORD }}
+          LIBRARIAN_SONATYPE_USERNAME: ${{ secrets.CENTRAL_PORTAL_USERNAME }}
+          LIBRARIAN_SIGNING_PRIVATE_KEY: ${{ secrets.GPG_KEY }}
+          LIBRARIAN_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.GPG_KEY_PASSWORD }}

.github/workflows/publish-snapshot.yaml

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+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  publish-snapshot:
+    runs-on: ubuntu-latest
+    if: github.event.repository.fork == false
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2
+      - run: |
+          LIBRARIAN_VERSION_SHA1=$GITHUB_SHA ./gradlew librarianPublishToGcs
+          ./gradlew librarianPublishToSnapshots
+        env:
+          LIBRARIAN_SONATYPE_PASSWORD: ${{ secrets.CENTRAL_PORTAL_PASSWORD }}
+          LIBRARIAN_SONATYPE_USERNAME: ${{ secrets.CENTRAL_PORTAL_USERNAME }}
+          LIBRARIAN_GOOGLE_SERVICES_JSON: ${{ secrets.GOOGLE_SERVICES_JSON }}