Update compile-backend.yml

Author: datahubtech

.github/workflows/compile-backend.yml

@@ -7,15 +7,11 @@ on: [push, pull_request]
 
 # jobs
 jobs:
-# compile
   compile-backend:
-# runs-on
     runs-on: ubuntu-latest
 # name
     name: Compile Backend Code
-# steps
     steps:
-# uses
       - uses: actions/checkout@v3
 
 # name
@@ -25,6 +21,14 @@ jobs:
           distribution: 'temurin'
           java-version: '17'
 
+# cache
+      - uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
 # name
       - name: Compile with Maven
         run: |