Add publish workflow

.github/workflows/gradle-build-publish.yml

@@ -0,0 +1,35 @@
+name: Gradle Publish to GitHub Packages
+on:
+  release:
+    types: [created]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v44
+      - name: Set up Node 14
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: '14'
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Cache Gradle packages
+        uses: actions/cache@v1
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
+      - name: Build with Gradle
+        uses: gradle/gradle-build-action@4137be6a8bf7d7133955359dbd952c0ca73b1021
+        with:
+          arguments: publish
+        env:
+          REACT_APP_API_URL: https://checkins.objectcomputing.com
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}