ci: Publish to Maven Central in publish workflow

This change updates the release and publish workflows in GitHub Actions
to ensure that we only publish the artifacts to Maven Central once the
release on GitHub is published.

When a version tag is pushed to GitHub, only a draft release will be
created containing the right artifacts.

2 files changed, 46 insertions, 19 deletions

diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 4a0f6cde..ce25802f 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -1,4 +1,5 @@
-name: Publish Docker image
+# Workflow for publishing the artifacts once a GitHub release is published
+name: Publish
 
 on:
   release:
@@ -6,16 +7,16 @@ on:
 
 jobs:
   push-simulator:
-    name: Push Simulator
+    name: Push Simulator to DockerHub
     runs-on: ubuntu-22.04
     steps:
       - name: Prepare
         id: prep
         run: |
           DOCKER_IMAGE=atlargeresearch/opendc
-          VERSION=edge
-          if [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/}
+          VERSION=3.0-SNAPSHOT
+          if [[ $GITHUB_REF == refs/tags/v* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
           fi
           echo "tags=${DOCKER_IMAGE}:${VERSION}" >> $GITHUB_OUTPUT
       - name: Login to DockerHub
@@ -31,16 +32,16 @@ jobs:
           repository: atlargeresearch/opendc
           tags: ${{ steps.prep.outputs.tags }}
   push-api:
-    name: Push API
+    name: Push API to DockerHub
     runs-on: ubuntu-22.04
     steps:
       - name: Prepare
         id: prep
         run: |
           DOCKER_IMAGE=atlargeresearch/opendc-web-api
-          VERSION=edge
-          if [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/}
+          VERSION=3.0-SNAPSHOT
+          if [[ $GITHUB_REF == refs/tags/v* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
           fi
           echo "tags=${DOCKER_IMAGE}:${VERSION}" >> $GITHUB_OUTPUT
       - name: Login to DockerHub
@@ -55,16 +56,16 @@ jobs:
           file: opendc-web/opendc-web-server/Dockerfile
           tags: ${{ steps.prep.outputs.tags }}
   push-ui:
-    name: Push UI
+    name: Push UI to DockerHub
     runs-on: ubuntu-22.04
     steps:
       - name: Prepare
         id: prep
         run: |
           DOCKER_IMAGE=atlargeresearch/opendc-web-ui
-          VERSION=edge
-          if [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/}
+          VERSION=3.0-SNAPSHOT
+          if [[ $GITHUB_REF == refs/tags/v* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
           fi
           echo "tags=${DOCKER_IMAGE}:${VERSION}" >> $GITHUB_OUTPUT
       - name: Login to DockerHub
@@ -78,3 +79,33 @@ jobs:
           push: true
           context: opendc-web/opendc-web-ui
           tags: ${{ steps.prep.outputs.tags }}
+  publish-maven-central:
+    name: Publish to Maven Central
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'zulu'
+          java-version: 17
+      - name: Prepare
+        id: prep
+        run: |
+          VERSION=3.0-SNAPSHOT
+          if [[ $GITHUB_REF == refs/tags/v* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+      - name: Publish with Gradle
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: publish -Pversion="${{ steps.prep.outputs.version }}"
+        env:
+          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.GPG_PRIVATE_KEY }}
+          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.GPG_PASSPHRASE }}
+          ORG_GRADLE_PROJECT_ossrhUsername: ${{ secrets.OSSRH_USERNAME }}
+          ORG_GRADLE_PROJECT_ossrhPassword: ${{ secrets.OSSRH_PASSWORD }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d8492262..711a0685 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,3 +1,4 @@
+# Workflow for creating a draft release once a new tag is pushed to GitHub
 name: Release
 
 on:
@@ -21,12 +22,7 @@ jobs:
       - name: Publish with Gradle
         uses: gradle/gradle-build-action@v2
         with:
-          arguments: publish
-        env:
-          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.GPG_PRIVATE_KEY }}
-          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.GPG_PASSPHRASE }}
-          ORG_GRADLE_PROJECT_ossrhUsername: ${{ secrets.OSSRH_USERNAME }}
-          ORG_GRADLE_PROJECT_ossrhPassword: ${{ secrets.OSSRH_PASSWORD }}
+          arguments: assembleDist
       - name: Create Release
         uses: softprops/action-gh-release@v1
         with: