Move docker tests to separate workflow

- do not run them on PR builds
- see #596

Author: mrbean-bremen

.github/workflows/dockertests.yml

@@ -0,0 +1,19 @@
+name: Dockertests
+
+on:
+  [push]
+
+jobs:
+  dockertests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        docker-image: [centos, debian, fedora, ubuntu]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup docker container
+      run: |
+        docker build -t pyfakefs -f $GITHUB_WORKSPACE/.github/workflows/dockerfiles/Dockerfile_${{ matrix.docker-image }} . --build-arg github_repo=$GITHUB_REPOSITORY --build-arg github_branch=$(basename $GITHUB_REF)
+    - name: Run tests
+      run: docker run -t pyfakefs

.github/workflows/pythonpackage.yml

@@ -95,18 +95,3 @@ jobs:
           python -m pyfakefs.tests.performance_test
         fi
       shell: bash
-
-#  setting up up docker containers currently fails
-#  dockertests:
-#    runs-on: ubuntu-latest
-#    strategy:
-#      fail-fast: false
-#      matrix:
-#        docker-image: [centos, debian, fedora, ubuntu]
-#    steps:
-#    - uses: actions/checkout@v2
-#    - name: Setup docker container
-#      run: |
-#        docker build -t pyfakefs -f $GITHUB_WORKSPACE/.github/workflows/dockerfiles/Dockerfile_${{ matrix.docker-image }} . --build-arg github_repo=$GITHUB_REPOSITORY --build-arg github_branch=$(basename $GITHUB_REF)
-#    - name: Run tests
-#      run: docker run -t pyfakefs