support to set branch

Author: LinuxSuRen

README.md

@@ -16,8 +16,9 @@ GitHub Action for backup your git repository.
 
 ## Environment Variables
 
-- `GIT_DEPLOY_KEY` - *Required* your deploy key (ssh private key) which has **Write access**
-- `TARGET_GIT` : **required**, your backup git repository (please use ssh or git protocol)
+- `GIT_DEPLOY_KEY`: **Required**, your deploy key (ssh private key) which has **Write access**
+- `TARGET_GIT`: **required**, your backup git repository (please use ssh or git protocol)
+- `BRANCH`: **required**, the branch you want to backup
 
 ```
 name: Backup Git Repository
@@ -37,4 +38,5 @@ jobs:
       env:
         GIT_DEPLOY_KEY: ${{ secrets.GIT_DEPLOY_KEY }}
         TARGET_GIT: "[email protected]:surenpi/surenpi.git"
+        BRANCH: master
 ```

entrypoint.sh

@@ -12,13 +12,13 @@ git config --global --add safe.directory /github/workspace
 
 git version
 git fetch --unshallow origin
-git checkout master
+git checkout ${BRANCH}
 git status
 git remote add backup ${TARGET_GIT}
 git remote -vv
 git config --global --add safe.directory /github/workspace
 git config --global user.name "${GITHUB_ACTOR}"
 git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
 echo 'ready to push'
-git push backup master -f
+git push backup ${BRANCH} -f
 git remote remove backup