Explicitely use the docker runner on some builds

.gitlab-ci.yml

@@ -26,6 +26,8 @@ variables:
     - cmake .. -DCMAKE_CXX_COMPILER=${COMPILER} -DCMAKE_BUILD_TYPE=${BUILD_TYPE} ${BOTAN} ${CARES} ${SYSTEMD} ${LIBIDN} ${LITESQL}
     - make biboumi -j$(nproc)
     - make check -j$(nproc)
+  tags:
+    - docker
 
 image: biboumi-test-fedora:latest
 
@@ -70,6 +72,9 @@ build:6:
 
 build:rpm:
   stage: build
+  image: biboumi-test-fedora:latest
+  tags:
+    - docker
   script:
     - cmake .. -DCMAKE_CXX_COMPILER=${COMPILER} -DCMAKE_BUILD_TYPE=${BUILD_TYPE} ${BOTAN} ${CARES} ${SYSTEMD} ${LIBIDN} ${LITESQL}
     - make rpm -j$(nproc)
@@ -100,11 +105,15 @@ build:rpm:
 test:debian:
   stage: test
   image: biboumi-test-debian:latest
+  tags:
+    - docker
   <<: *basic_test
 
 test:fedora:
   stage: test
   image: biboumi-test-fedora:latest
+  tags:
+    - docker
   <<: *basic_test
 
 test:openbsd: