Try to add caching to the github action workflow.

.github/workflows/maven-publish.yml

@@ -16,20 +16,27 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-      with: 
-        submodules: recursive
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
-      with:
-        java-version: 1.8
-        server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
-        settings-path: ${{ github.workspace }} # location for the settings.xml file
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+          server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
+          settings-path: ${{ github.workspace }} # location for the settings.xml file
 
-    - name: Build with Maven
-      run: mvn -B package --file pom.xml
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Build with Maven
+        run: mvn -B package --file pom.xml
 
-    - name: Publish to GitHub Packages Apache Maven
-      run: mvn deploy -s $GITHUB_WORKSPACE/settings.xml
-      env:
-        GITHUB_TOKEN: ${{ github.token }}
+      - name: Publish to GitHub Packages Apache Maven
+        run: mvn deploy -s $GITHUB_WORKSPACE/settings.xml
+        env:
+          GITHUB_TOKEN: ${{ github.token }}

pom.xml

@@ -23,7 +23,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <dir>${project.build.directory}</dir>
-        <revision>1.6.2<!---SNAPSHOT-${BUILD_NUMBER}--></revision>
+        <revision>1.6.2-SNAPSHOT-${BUILD_NUMBER}</revision>
     </properties>
 
     <distributionManagement>