Turn off Maven connection pooling to avoid connection issues on CI

The problem and solution are explained in actions/runner-images#1499 (comment)

Author: filiphr

.github/workflows/main.yml

@@ -2,6 +2,11 @@ name: CI
 
 on: [push, pull_request]
 
+env:
+  MAVEN_ARGS: >-
+    -V -B --no-transfer-progress
+    -Dhttp.keepAlive=false -Dmaven.wagon.http.pool=false -Dmaven.wagon.httpconnectionManager.ttlSeconds=120
+
 jobs:
   linux_maven:
     strategy:
@@ -18,7 +23,7 @@ jobs:
         with:
           java-version: ${{ matrix.java }}
       - name: 'Test'
-        run: ./mvnw -V -B -U clean verify
+        run: ./mvnw ${MAVEN_ARGS} -U clean verify
   linux_gradle:
     strategy:
       fail-fast: false
@@ -45,7 +50,7 @@ jobs:
         with:
           java-version: 8
       - name: 'Test'
-        run: ./mvnw -V -B -U clean verify
+        run: ./mvnw ${MAVEN_ARGS} -U clean verify
   mac_maven:
     name: 'Mac OS'
     runs-on: macos-latest
@@ -56,4 +61,4 @@ jobs:
         with:
           java-version: 8
       - name: 'Test'
-        run: ./mvnw -V -B -U clean verify
+        run: ./mvnw ${MAVEN_ARGS} -U clean verify