add github actions print_path.yml

.github/workflows/print_path.yml

@@ -25,6 +25,7 @@ jobs:
           echo "launch path after checkout=$(pwd)"
           cd ~
           echo "~=$(pwd)"
-          echo "HOME=$(HOME)"
-          echo "GITHUB_WORKSPACE=$(GITHUB_WORKSPACE)"
-          echo "if you want to use `GITHUB_WORKSPACE` in yml, try ${{ github.workspace }}"
+          echo "HOME=$HOME"
+          echo "GITHUB_WORKSPACE=$GITHUB_WORKSPACE"
+          echo "{{ github.workspace }}=${{ github.workspace }}"
+          echo "GITHUB_WORKSPACE and {{ github.workspace }} should has same value, difference is: GITHUB_WORKSPACE replace when bash executing, {{ github.workspace }} replace when yml parsing"