Add deploy key functionality (ad-m#115)

* Add deploy key functionality

Author: ZPascal

.github/workflows/build.yml

@@ -7,14 +7,14 @@ on:
 jobs:
 
   build:
- 
+
     runs-on: ubuntu-latest
- 
+
     steps:
-    - uses: actions/checkout@master
-    - name: Verify action syntax 
-      # The action should not publish any real changes, but should succeed.
-      uses: './'
-      with:
-        github_token: '${{ secrets.GITHUB_TOKEN }}'
-        branch: '${{ github.ref }}'
+      - uses: actions/checkout@master
+      - name: Verify action syntax
+        # The action should not publish any real changes, but should succeed.
+        uses: './'
+        with:
+          github_token: '${{ secrets.GITHUB_TOKEN }}'
+          branch: '${{ github.ref }}'

README.md

@@ -39,11 +39,37 @@ jobs:
         branch: ${{ github.ref }}
 ```
 
+An example workflow to authenticate with GitHub Platform via Deploy Keys or in general SSH:
+
+```yaml
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
+    - name: Create local changes
+      run: |
+        ...
+    - name: Commit files
+      run: |
+        git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
+        git config --local user.name "github-actions[bot]"
+        git commit -m "Add changes" -a
+    - name: Push changes
+      uses: ad-m/github-push-action@master
+      with:
+        branch: ${{ github.ref }}
+	ssh: true
+```
+
 ### Inputs
 
 | name | value | default | description |
 | ---- | ----- | ------- | ----------- |
 | github_token | string  |  `${{ github.token }}` | [GITHUB_TOKEN](https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow) <br /> or a repo scoped <br /> [Personal Access Token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token). |
+| ssh | boolean | false | Determines if ssh is used. |    
 | branch | string | (default) | Destination branch to push changes. <br /> Can be passed in using `${{ github.ref }}`. |
 | force | boolean | false | Determines if force push is used. |
 | tags | boolean | false | Determines if `--tags` is used. |

action.yml

@@ -13,6 +13,9 @@ inputs:
     description: 'GitHub url or GitHub Enterprise url'
     required: true
     default: ${{ github.server_url }}
+  ssh:
+    description: 'Specify if ssh should be used'
+    required: false
   repository:
     description: 'Repository name to push. Default or empty value represents current github repository (${GITHUB_REPOSITORY})'
     default: ''

start.sh

@@ -23,7 +23,13 @@ fi
 
 cd ${INPUT_DIRECTORY}
 
-remote_repo="${INPUT_GITHUB_URL_PROTOCOL}//${GITHUB_ACTOR}:${INPUT_GITHUB_TOKEN}@${INPUT_GITHUB_URL}/${REPOSITORY}.git"
+
+if ${INPUT_SSH}; then
+    remote_repo="git@${INPUT_GITHUB_URL}:${REPOSITORY}.git"
+else
+    remote_repo="${INPUT_GITHUB_URL_PROTOCOL}//${GITHUB_ACTOR}:${INPUT_GITHUB_TOKEN}@${INPUT_GITHUB_URL}/${REPOSITORY}.git"
+fi
+
 git config --local --add safe.directory ${INPUT_DIRECTORY}
 
 git push "${remote_repo}" HEAD:${INPUT_BRANCH} --follow-tags $_FORCE_OPTION $_TAGS;