ci: add automated deployment for changed files (#105)

- Add a new job `changes` to the `ci.yml` file
- Copy changed files to a server in the `changes` job
- Add a YAML code block to the `README.md` file

fix https://github.com/appleboy/scp-action/issues/73

.github/workflows/ci.yml

@@ -113,3 +113,27 @@ jobs:
         port: ${{ secrets.PORT }}
         source: distfiles/*
         target: test
+
+  changes:
+    name: test changed-files
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+
+    - name: Get changed files
+      id: changed-files
+      uses: tj-actions/changed-files@v35
+      with:
+        since_last_remote_commit: true
+        separator: ","
+
+    - name: copy file to server
+      uses: ./
+      with:
+        host: ${{ secrets.HOST }}
+        username: ${{ secrets.USERNAME }}
+        key: ${{ secrets.KEY }}
+        port: ${{ secrets.PORT }}
+        source: ${{ steps.changed-files.outputs.all_changed_files }}
+        target: test