feat(ci): auto go mod tidy examples (#561)

* feat(ci): auto go mod tidy examples

Signed-off-by: Carlos A Becker <caarlos0@users.noreply.github.com>

* fix: tutorials as well

* fix: checkout

---------

Signed-off-by: Carlos A Becker <caarlos0@users.noreply.github.com>

.github/workflows/examples.yml

@@ -0,0 +1,38 @@
+name: examples
+
+on:
+  push:
+    branches:
+      - 'master'
+    paths:
+      - '.github/workflows/examples.yml'
+      - './examples/go.mod'
+      - './examples/go.sum'
+      - './tutorials/go.mod'
+      - './tutorials/go.sum'
+      - './go.mod'
+      - './go.sum'
+  workflow_dispatch: {}
+
+jobs:
+  tidy:
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '^1'
+          cache: true
+      - shell: bash
+        run: |
+          (cd ./examples && go mod tidy)
+          (cd ./tutorials && go mod tidy)
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "chore: go mod tidy tutorials and examples"
+          branch: master
+          commit_user_name: actions-user
+          commit_user_email: actions@github.com
+