ci: add workflow for automatic dependency updates

Author: yutachaos

.github/workflows/update-deps.yml

@@ -0,0 +1,54 @@
+name: Update Dependencies
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    paths:
+      - 'go.mod'
+      - 'go.sum'
+  push:
+    branches:
+      - main
+    paths:
+      - 'go.mod'
+      - 'go.sum'
+
+jobs:
+  update-deps:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref }}
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.21'
+          cache: true
+
+      - name: Run go mod tidy
+        run: go mod tidy
+
+      - name: Check for changes
+        id: git-check
+        run: |
+          if [[ -n $(git status --porcelain) ]]; then
+            echo "changes=true" >> $GITHUB_OUTPUT
+          else
+            echo "changes=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Commit and push if changed
+        if: steps.git-check.outputs.changes == 'true'
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email 'github-actions[bot]@users.noreply.github.com'
+          git add go.mod go.sum
+          git commit -m "chore(deps): update dependencies with go mod tidy"
+          git push