fix: Modrinth upload action missing steps

.github/workflows/modrinth_upload.yml

@@ -19,16 +19,28 @@ jobs:
         with:
           tag: ${{ steps.release.outputs.tag_name }}
 
+      - name: Modify version scheme
+        run: |
+          if [[ "${{ steps.release.outputs.tag_name }}" == *"pre"* ]]; then
+              echo "Replacing prerelease version scheme with SNAPSHOT"
+              echo "VERSION=$(echo ${{ steps.release.outputs.tag_name }} | sed -E 's/-pre.*/-SNAPSHOT/')" >> $GITHUB_ENV
+          else
+              echo "Using release version scheme"
+              echo "VERSION=${{ steps.release.outputs.tag_name }}" >> $GITHUB_ENV
+          fi
+
       - name: Parse release type
         run: |
           if [[ "${{ steps.release-info.outputs.prerelease }}" == "true" ]]; then
-              echo "Replacing prerelease version scheme with SNAPSHOT"
               echo "RELEASE_TYPE=beta" >> $GITHUB_ENV
           else
-              echo "Using release version scheme"
               echo "RELEASE_TYPE=release" >> $GITHUB_ENV
           fi
 
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ steps.release-info.outputs.tag_name }}
+
       - name: Upload to modrinth.com
         uses: gradle/gradle-build-action@v2
         with: