Configure ci-friendly versions for maven

See strongbox/strongbox#1927

.github/workflows/gh-registry.yml

@@ -77,12 +77,14 @@ jobs:
       - uses: actions/setup-java@v1
         with:
             java-version: 1.8
+      # generate GitHub Package Registry ci-friendly version to avoid collision
+      - run: echo "GPR_VERSION=$(date '+%Y%m%d.%H%M')" >> $GITHUB_ENV
       - name: Maven install
-        run: mvn clean install
+        run: mvn -Dgpr.version=$GPR_VERSION clean install
         working-directory: 'hello-strongbox-maven'
       # This is seperate so it may only be deployed conditionally
       - name: Maven deploy
-        run: mvn -DaltDeploymentRepository=github::default::https://maven.pkg.github.com/$GITHUB_REPOSITORY deploy
+        run: mvn -Dgpr.version=$GPR_VERSION -DaltDeploymentRepository=github::default::https://maven.pkg.github.com/$GITHUB_REPOSITORY deploy
         working-directory: 'hello-strongbox-maven'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

hello-strongbox-maven/pom.xml

@@ -7,10 +7,18 @@
 
     <groupId>org.carlspring.strongbox.examples</groupId>
     <artifactId>hello-strongbox-maven</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <version>${gpr.version}</version>
 
     <inceptionYear>2019</inceptionYear>
 
+    <properties>
+        <!-- GPR-friendly artifact version when deploying to GitHub Package Registry -->
+        <!-- The version string is generated via a GitHub action that deploys the artifact to the GitHub Package Registry -->
+        <!-- This is necessary as GitHub does not support overriding of published artifacts -->
+        <!-- See https://docs.github.com/en/free-pro-team@latest/packages/publishing-and-managing-packages/deleting-a-package#about-public-package-deletion -->
+        <gpr.version>1.0-SNAPSHOT</gpr.version>
+    </properties>
+
     <dependencies>
         <dependency>
             <groupId>junit</groupId>