Fix docker builds (#9805)

* move docker test logic to share/spack/qa
* update Dockerfile for archlinux

.travis.yml

@@ -202,28 +202,6 @@ services:
 
 script:
   - share/spack/qa/run-$TEST_SUITE-tests
-  - if [[ "$TEST_SUITE" == "docker build" ]]; then
-        login_attempted=0; login_success=0;
-        for config in share/spack/docker/config/* ; do
-            source "$config" ;
-            ./share/spack/docker/build-image.sh;
-            if [ "$TRAVIS_EVENT_TYPE" != "pull_request" ]; then
-                if [ "$login_attempted" '=' '0' ]; then
-                    if echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin; then
-                        login_success=1;
-                    fi;
-                    login_attempted=1;
-                fi;
-                if [ "$login_success" '=' '1' ]; then
-                    ./share/spack/docker/push-image.sh;
-                fi
-            fi
-        done;
-    fi
-  - if [[ "$TEST_SUITE" == "unit" || "$TEST_SUITE" == "build" ]]; then
-        codecov --env PYTHON_VERSION
-                --required --flags "${TEST_SUITE}${TRAVIS_OS_NAME}";
-    fi
 
 after_success:
   - ccache -s