chore(metadata): add update-metadata GitHub Actions Workflow

.github/workflows/update-metadata.yml

@@ -0,0 +1,35 @@
+---
+name: Update Metadata
+concurrency: jimeh/emacs-builds/update-metadata
+on:
+  schedule:
+    - cron: "0 * * * *"
+  workflow_dispatch:
+
+jobs:
+  update-metadata:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout tap repository main branch
+        uses: actions/checkout@v2
+        with:
+          ref: meta
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('builder/**/go.sum') }}
+          restore-keys: ${{ runner.os }}-go-
+      - name: update total downloads shield JSON
+        run: go run . badges downloads -o total-downloads/shield.json
+      - name: commit and push changes to meta branch
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "chore(meta): update metadata files"
+          commit_user_name: github-actions[bot]
+          commit_user_email: github-actions[bot]@users.noreply.github.com
+          commit_author: >-
+            github-actions[bot] <github-actions[bot]@users.noreply.github.com>
+          skip_dirty_check: false