Add CurseForge release workflow

.github/workflows/release.yml

@@ -0,0 +1,34 @@
+name: Release to CurseForge
+
+on:
+  release:
+    types: [ released ]
+
+jobs:
+  curseforge_release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+
+      - name: Set CurseForge Variables
+        run: . scripts/set_curseforge_env.sh
+
+      - name: Fetch Github Release Asset
+        uses: dsaltares/fetch-gh-release-asset@0.0.5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: ${{ github.event.release.id }}
+          file: OpenInv.jar
+
+      - name: Create CurseForge Release
+        uses: itsmeow/curseforge-upload@v3
+        with:
+          token: ${{ secrets.CURSEFORGE_TOKEN }}
+          project_id: 31432
+          game_endpoint: minecraft
+          file_path: ./OpenInv.jar
+          changelog: ${{ github.event.release.body }}
+          display_name: ${{ github.event.release.name }}
+          game_versions: ${{ env.CURSEFORGE_MINECRAFT_VERSIONS }}
+          release-type: release