do beta versioning on gh action builds

.github/workflows/gradle_build.yml

@@ -19,7 +19,21 @@ jobs:
       with:
         java-version: '8'
         distribution: 'adopt'
-        
+
+    - uses: actions/github-script@v2
+      id: fname
+      name: apply beta versioning
+      with:
+        result-encoding: string
+        script: |
+          const fs = require("fs");
+          let file = fs.readFileSync("./gradle.properties");
+          file = file.toString().split("\n").map(e => e.trim().startsWith("mod_version") ? `${e}-beta-${process.env.GITHUB_SHA.substring(0, 7)}` : e).join("\n");
+          fs.writeFileSync("./gradle.properties", file);
+          const mod_version = file.toString().split("\n").filter(e => e.trim().startsWith("mod_version"))[0].split("=")[1].trim();
+          const archives_base_name = file.toString().split("\n").filter(e => e.trim().startsWith("archives_base_name"))[0].split("=")[1].trim();
+          return `${archives_base_name}-${mod_version}`;
+
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew