Fail GitHub release when Tags Clash (#53)

.github/workflows/github_release.yml

@@ -15,6 +15,23 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v3
 
+      - name: Get Mod Version
+        id: get_version
+        run: echo ::set-output name=version::$(sed -n 's/^modVersion = \(.*\)/\1/p' < gradle.properties*)
+
+      - name: Get Previous tag
+        id: previous_tag
+        uses: pozetroninc/github-action-get-latest-release@master
+        with:
+          repository: ${{ github.repository }}
+
+      # exit CI early as a failure if creating this release clashes with the previous version
+      - name: Check if Version Bump is Needed
+        if: ${{ format('v{0}', steps.get_version.outputs.version) == (steps.previous_tag.outputs.release) }}
+        uses: actions/github-script@v6
+        with:
+          script: core.setFailed("A version bump from ${{ steps.previous_tag.outputs.release }} is required!")
+
       - name: Set up JDK 8
         uses: actions/setup-java@v2
         with:
@@ -35,10 +52,6 @@ jobs:
           chmod +x gradlew
           ./gradlew build
 
-      - name: Get Mod Version
-        id: get_version
-        run: echo ::set-output name=version::$(sed -n 's/^modVersion = \(.*\)/\1/p' < gradle.properties*)
-
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v1
         with: