feat: add v2 action.yml support

Dockerfile

@@ -1,10 +1,5 @@
 FROM alpine
 
-LABEL "com.github.actions.name"="Git Sync Action"
-LABEL "com.github.actions.description"="🔃 Sync between two independent repositories"
-LABEL "com.github.actions.icon"="git-branch"
-LABEL "com.github.actions.color"="black"
-
 LABEL "repository"="http://github.com/wei/git-sync"
 LABEL "homepage"="http://github.com/wei/git-sync"
 LABEL "maintainer"="Wei He <github@weispot.com>"

README.md

@@ -24,25 +24,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: repo-sync
-      uses: wei/git-sync@v1
-      env:
-        SOURCE_REPO: ""
-        SOURCE_BRANCH: ""
-        DESTINATION_REPO: ""
-        DESTINATION_BRANCH: ""
-        SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+      uses: wei/git-sync@v2
       with:
-        args: $SOURCE_REPO $SOURCE_BRANCH $DESTINATION_REPO $DESTINATION_BRANCH
+        source_repo: ""
+        source_branch: ""
+        destination_repo: ""
+        destination_branch: ""
+        ssh_private_key: ${{ secrets.SSH_PRIVATE_KEY }}
 ```
-`SSH_PRIVATE_KEY` can be omitted if using authenticated HTTPS repo clone urls like `https://username:access_token@github.com/username/repository.git`.
+`ssh_private_key` can be omitted if using authenticated HTTPS repo clone urls like `https://username:access_token@github.com/username/repository.git`.
 
 #### Advanced: Sync all branches
 
-To Sync all branches from source to destination, use `SOURCE_BRANCH: "refs/remotes/source/*"` and `DESTINATION_BRANCH: "refs/heads/*"`. But be careful, branches with the same name including `master` will be overwritten.
+To Sync all branches from source to destination, use `source_branch: "refs/remotes/source/*"` and `destination_branch: "refs/heads/*"`. But be careful, branches with the same name including `master` will be overwritten.
 
 #### Advanced: Sync all tags
 
-To Sync all tags from source to destination, use `SOURCE_BRANCH: "refs/tags/*"` and `DESTINATION_BRANCH: "refs/tags/*"`. But be careful, tags with the same name will be overwritten.
+To Sync all tags from source to destination, use `source_branch: "refs/tags/*"` and `destination_branch: "refs/tags/*"`. But be careful, tags with the same name will be overwritten.
 
 ### Docker
 ```

action.yml

@@ -0,0 +1,32 @@
+name: Git Sync Action
+author: Wei He <github@weispot.com>
+description: 🔃 Sync between two independent repositories
+branding:
+  icon: 'git-branch'
+  color: 'gray-dark'
+inputs:
+  source_repo:
+    description: GitHub repo slug or full clone url
+    required: true
+  source_branch:
+    description: Branch name to sync from
+    required: true
+  destination_repo:
+    description: GitHub repo slug or full clone url
+    required: true
+  destination_branch:
+    description: Branch name to sync to
+    required: true
+  ssh_private_key:
+    description: SSH key used to authenticate with git clone urls provided (optional if public or https clone url with authentication)
+    required: false
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  env:
+    SSH_PRIVATE_KEY: ${{ inputs.ssh_private_key }}
+  args:
+    - ${{ inputs.source_repo }}
+    - ${{ inputs.source_branch }}
+    - ${{ inputs.destination_repo }}
+    - ${{ inputs.destination_branch }}