only deploy SNAPSHOTs unless tagged

Author: overheadhunter

.github/workflows/build.yml

@@ -59,6 +59,11 @@ jobs:
         run: |
           PROJECT_VERSION=$(mvn help:evaluate "-Dexpression=project.version" -q -DforceStdout)
           test "$PROJECT_VERSION" = "${GITHUB_REF##*/}"
+      - name: Verify project version is -SNAPSHOT
+        if: startsWith(github.ref, 'refs/tags/') == false
+        run: |
+          PROJECT_VERSION=$(mvn help:evaluate "-Dexpression=project.version" -q -DforceStdout)
+          test "${PROJECT_VERSION: -9}" = "-SNAPSHOT"
       - name: Deploy to Maven Central
         run: mvn deploy -B -DskipTests -Psign,deploy-central --no-transfer-progress
         env:
@@ -87,6 +92,11 @@ jobs:
         run: |
           PROJECT_VERSION=$(mvn help:evaluate "-Dexpression=project.version" -q -DforceStdout)
           test "$PROJECT_VERSION" = "${GITHUB_REF##*/}"
+      - name: Verify project version is -SNAPSHOT
+        if: startsWith(github.ref, 'refs/tags/') == false
+        run: |
+          PROJECT_VERSION=$(mvn help:evaluate "-Dexpression=project.version" -q -DforceStdout)
+          test "${PROJECT_VERSION: -9}" = "-SNAPSHOT"
       - name: Deploy to GitHub Packages
         run: mvn deploy -B -DskipTests -Psign,deploy-github --no-transfer-progress
         env: