Disable git safe repo check and optimize behavior (#10)

* Disable git safe repo check and optimize behavior

List of changes:

- Add global config option to make our clone directory "safe". Without
  this, the github action fails completely due to some security features
  implemented in the newest version of git.
- Consolidated a lot of git operations toward the bottom of the
  entrypoint script to avoid popping in & out of the clone directory
  more than needed.
- Use `clone` instead of `init` + `pull` for simpler logic and automatic
  `origin` remote to make later operations simpler.
- The final `git push` command has been simplified greatly.

* Use `GH_NAME` in the clone URL.

entrypoint.sh

@@ -28,17 +28,12 @@ if [ -z "$WIKI_DIR" ]; then
     WIKI_DIR='wiki/'
 fi
 
-echo "Configuring wiki git..."
-mkdir $TEMP_CLONE_FOLDER
-cd $TEMP_CLONE_FOLDER
-git init
-
-# Setup credentials
-git config user.name $GH_NAME
-git config user.email $GH_MAIL
+# Disable Safe Repository checks
+git config --global --add safe.directory "/github/workspace"
+git config --global --add safe.directory "/github/workspace/$TEMP_CLONE_FOLDER"
 
-git pull https://$GH_TOKEN@github.com/$REPO.wiki.git
-cd ..
+echo "Cloning wiki git..."
+git clone https://$GH_NAME:$GH_TOKEN@github.com/$REPO.wiki.git $TEMP_CLONE_FOLDER
 
 # Get commit message
 if [ -z "$WIKI_PUSH_MESSAGE" ]; then
@@ -66,6 +61,11 @@ fi
 
 echo "Pushing to Wiki"
 cd $TEMP_CLONE_FOLDER
+
+# Setup credentials
+git config user.name $GH_NAME
+git config user.email $GH_MAIL
+
 git add .
 git commit -m "$message"
-git push --set-upstream https://$GH_NAME:$GH_TOKEN@github.com/$REPO.wiki.git master || git push --set-upstream https://$GH_TOKEN@github.com/$REPO.wiki.git master
+git push origin master