chore: align test_docker container launch with playwright-browsers

Mirrors the docker run flags used by microsoft/playwright-browsers'
tests-docker.yml so the Java and Node test environments stay in sync.

  - run as pwuser (--user=pwuser --workdir /home/pwuser) instead of root
  - explicit --platform linux/<arch>
  - drop --ipc=host; set --shm-size=2g instead
  - deliver the repo via docker cp + chown rather than a bind mount,
    and move the image-baked /root/.m2 into pwuser's home so the
    locally-installed SNAPSHOT artifacts resolve
  - paths /root/playwright -> /home/pwuser/playwright
  - add workflow_dispatch trigger so the workflow can be re-run manually

Author: yury-s

.github/workflows/test_docker.yml

@@ -1,5 +1,6 @@
 name: Docker
 on:
+  workflow_dispatch:
   push:
     paths:
       - '.github/workflows/test_docker.yml'
@@ -28,24 +29,49 @@ jobs:
       matrix:
         flavor: [jammy, noble]
         runs-on: [ubuntu-24.04, ubuntu-24.04-arm]
+        include:
+          - runs-on: ubuntu-24.04
+            arch: amd64
+          - runs-on: ubuntu-24.04-arm
+            arch: arm64
     steps:
       - uses: actions/checkout@v6
       - name: Build Docker image
         run: |
-          ARCH="${{ matrix.runs-on == 'ubuntu-24.04-arm' && 'arm64' || 'amd64' }}"
-          bash utils/docker/build.sh --$ARCH ${{ matrix.flavor }} playwright-java:localbuild-${{ matrix.flavor }}
+          bash utils/docker/build.sh --${{ matrix.arch }} ${{ matrix.flavor }} playwright-java:localbuild-${{ matrix.flavor }}
       - name: Start container
         run: |
-            CONTAINER_ID=$(docker run --rm -e CI -e PW_MAX_RETRIES --ipc=host -v "$(pwd)":/root/playwright --name playwright-docker-test -d -t playwright-java:localbuild-${{ matrix.flavor }} /bin/bash)
+            CONTAINER_ID=$(docker run \
+              --rm \
+              --name playwright-docker-test \
+              --platform linux/${{ matrix.arch }} \
+              --user=pwuser \
+              --workdir /home/pwuser \
+              --shm-size=2g \
+              -e CI \
+              -e PW_MAX_RETRIES \
+              -d -t \
+              playwright-java:localbuild-${{ matrix.flavor }} /bin/bash)
             echo "CONTAINER_ID=$CONTAINER_ID" >> $GITHUB_ENV
 
+      - name: Copy repository inside docker container
+        run: |
+            docker cp . "$CONTAINER_ID":/home/pwuser/playwright
+            # /root/.m2 was populated as root during image build; move it to
+            # pwuser so the locally-installed SNAPSHOT artifacts resolve.
+            docker exec --user root "$CONTAINER_ID" bash -c '
+              chown -R pwuser /home/pwuser/playwright
+              mv /root/.m2 /home/pwuser/.m2
+              chown -R pwuser /home/pwuser/.m2
+            '
+
       - name: Run test in container
         run: |
-            docker exec "$CONTAINER_ID" /root/playwright/tools/test-local-installation/create_project_and_run_tests.sh
+            docker exec "$CONTAINER_ID" /home/pwuser/playwright/tools/test-local-installation/create_project_and_run_tests.sh
 
       - name: Test ClassLoader
         run: |
-            docker exec "${CONTAINER_ID}" /root/playwright/tools/test-spring-boot-starter/package_and_run_async_test.sh
+            docker exec "${CONTAINER_ID}" /home/pwuser/playwright/tools/test-spring-boot-starter/package_and_run_async_test.sh
 
       - name: Stop container
         run: |