I must say that I'm not familiar with GitHub workflows...

.github/workflows/main.yml

@@ -1,30 +0,0 @@
-name: Generate Installable Plugin or Theme, and Upload as Release Asset
-on:
-  release:
-    types: [published]
-jobs:
-  build:
-    name: Upload Release Asset
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-      - name: setup git config
-        run: |
-          git config user.name "GitHub Actions Bot"
-          git config user.email "<>"
-      - name: Create artifact
-        run : |
-          git archive -o ${{ github.event.repository.name }}-${{ github.ref_name }}.zip --prefix ${{ github.event.repository.name }}/ HEAD 
-          ls
-      - name: Upload artifact
-        uses: actions/upload-artifact@v2
-        with:
-            name: ${{ github.event.repository.name }}-${{ github.ref_name }}
-            path: ${{ github.event.repository.name }}-${{ github.ref_name }}.zip
-      - name: Upload to release
-        uses: JasonEtco/upload-to-release@master
-        with:
-          args: ${{ github.event.repository.name }}-${{ github.ref_name }}.zip application/zip
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,2 +1,3 @@
 .git export-ignore
 .gitignore export-ignore
+.github export-ignore