Improve GH action to avoid attempts to deploy non-SNAPSHOT version (during release process)

Author: cowtowncoder

.github/workflows/main.yml

@@ -34,11 +34,13 @@ jobs:
         # See https://github.com/actions/setup-java/blob/v2/docs/advanced-usage.md#Publishing-using-Apache-Maven
         # gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }} # Value of the GPG private key to import
         # gpg-passphrase: MAVEN_GPG_PASSPHRASE # env variable for GPG private key passphrase
-    - name: Build
+    - name: Build project
       run: ./mvnw -V -B -ff -ntp verify
+    - name: Extract project Maven version
+      id: projectVersion
+      run: echo ::set-output name=version::$(./mvnw org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate -DforceStdout -Dexpression=project.version -q)
     - name: Deploy snapshot
-      if: github.event_name != 'pull_request' && matrix.java_version == '8'
-      env:
+      if: github.event_name != 'pull_request' && matrix.java_version == '8' && endsWith(steps.projectVersion.output      env:
         CI_DEPLOY_USERNAME: ${{ secrets.CI_DEPLOY_USERNAME }}
         CI_DEPLOY_PASSWORD: ${{ secrets.CI_DEPLOY_PASSWORD }}
         # MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}