ci: don't use global variables and definitions

.gitlab-ci.yml

@@ -8,12 +8,22 @@ stages:
  - package
  - test-package
 
+build:native:
+  stage: build
+  artifacts:
+    paths:
+      - _build
   variables:
+    BUILD_OPTS: -Dgtk_doc=true ${COMMON_BUILD_OPTS}
     DEPS: build-essential git
     WANT_BUILD_DEPS: "true"
-  IMAGE: pureos/byzantium
     COMMON_BUILD_OPTS: --werror
-
+  except:
+    variables:
+      - $PKG_ONLY == "1"
+  image: pureos/byzantium
+  tags:
+    - librem5
   before_script:
     - export DEBIAN_FRONTEND=noninteractive
     - apt-get -y update
@@ -23,64 +33,34 @@ before_script:
     - apt-get -y update
     - apt-get -y build-dep .
     - ulimit -c unlimited
-
-.tags: &tags
-  tags:
-    - librem5
-
-.build_step: &build_step
   script:
     - 'echo "Build opts: ${BUILD_OPTS}"'
     - meson ${BUILD_OPTS} . _build
     - ninja -C _build
 
-build:native:
-  <<: *tags
-  image: $IMAGE
-  stage: build
-  artifacts:
-    paths:
-      - _build
-  variables:
-    BUILD_OPTS: -Dgtk_doc=true ${COMMON_BUILD_OPTS}
-  <<: *build_step
-  except:
-    variables:
-      - $PKG_ONLY == "1"
-
 test:native:
-  <<: *tags
+  extends: build:native
-  image: $IMAGE
   stage: test
   dependencies:
     - build:native
   script:
     - export LC_ALL=C.UTF-8
     - xvfb-run ninja -C _build test
-  except:
-    variables:
-      - $PKG_ONLY == "1"
 
 build-gtkdoc:
-  <<: *tags
+  extends: build:native
-  image: $IMAGE
   stage: test
   dependencies:
     - build:native
-  <<: *build_step
   script:
     - ninja -C _build calls-doc
     - mv _build/doc/html/ _reference/
   artifacts:
     paths:
       - _reference
-  except:
-    variables:
-      - $PKG_ONLY == "1"
 
 check-po:
-  <<: *tags
+  extends: build:native
-  image: $IMAGE
   stage: test
   dependencies:
     - build:native
@@ -93,6 +73,3 @@ check-po:
     # in this case
     - cd po/
     - intltool-update -m 2>&1 | grep -qs '/.*\.c' && { intltool-update -m; exit 1; } || exit 0
-  except:
-    variables:
-      - $PKG_ONLY == "1"