ci: define the dependencies between jobs

This means that jobs can start the moment they are ready, instead
of waiting for the previous stage to finish.

Also define their interruptibility so new pipelines can automatically
cancel the previous ones.

https://docs.gitlab.com/ee/ci/yaml/index.html#needs

.gitlab-ci.yml

@@ -36,6 +36,9 @@ workflow:
     - if: $CI_COMMIT_TAG
     - if: $CI_COMMIT_BRANCH
 
+default:
+  interruptible: true
+
 variables:
   FDO_UPSTREAM_REPO: gstreamer/gstreamer-rs
 
@@ -266,11 +269,17 @@ test msrv:
   extends:
     - '.cargo test'
     - .img-msrv
+  needs:
+    - job: 'build-msrv'
+      artifacts: false
 
 test stable:
   extends:
     - '.cargo test'
     - .img-stable
+  needs:
+    - job: 'build-stable'
+      artifacts: false
 
 test stable all-features:
   variables:
@@ -279,12 +288,20 @@ test stable all-features:
   extends:
     - '.cargo test'
     - .img-stable
+  needs:
+    - job: 'build-stable'
+      artifacts: false
+
 
 test nightly:
   allow_failure: true
   extends:
     - '.cargo test'
     - .img-nightly
+  needs:
+    - job: 'build-nightly'
+      artifacts: false
+
 
 test nightly all-features:
   allow_failure: true
@@ -294,6 +311,9 @@ test nightly all-features:
   extends:
     - '.cargo test'
     - .img-nightly
+  needs:
+    - job: 'build-nightly'
+      artifacts: false
 
 .cargo test sys:
   stage: "test"
@@ -342,16 +362,25 @@ test stable sys:
   extends:
     - '.cargo test sys'
     - .img-stable
+  needs:
+    - job: 'build-stable'
+      artifacts: false
 
 test msrv sys:
   extends:
     - '.cargo test sys'
     - .img-msrv
+  needs:
+    - job: 'build-msrv'
+      artifacts: false
 
 test nightly sys:
   extends:
     - '.cargo test sys'
     - .img-nightly
+  needs:
+    - job: 'build-nightly'
+      artifacts: false
 
 rustfmt:
   extends: .img-stable
@@ -359,18 +388,27 @@ rustfmt:
   script:
     - cargo fmt --version
     - cargo fmt -- --color=always --check
+  needs:
+    - job: 'build-stable'
+      artifacts: false
 
 check commits:
   extends: .img-stable
   stage: "lint"
   script:
     - ci-fairy check-commits --textwidth 0 --no-signed-off-by
+  needs:
+    - job: 'build-stable'
+      artifacts: false
 
 clippy:
   extends: .img-stable
   stage: 'extras'
   variables:
     CLIPPY_LINTS: -D warnings
+  needs:
+    - job: 'build-stable'
+      artifacts: false
   script:
     - cargo clippy --version
       # Keep features in sync with above
@@ -403,6 +441,9 @@ clippy:
 deny:
   extends: .img-stable
   stage: 'extras'
+  needs:
+    - job: 'build-stable'
+      artifacts: false
   rules:
     - if: $CI_PIPELINE_SOURCE == "schedule"
   script:
@@ -413,12 +454,18 @@ gir-checks:
     GIT_SUBMODULE_STRATEGY: recursive
   extends: .img-stable
   stage: 'extras'
+  needs:
+    - job: 'build-stable'
+      artifacts: false
   script:
     - python3 ci/gir-checks.py
 
 outdated:
   extends: .img-stable
   stage: 'extras'
+  needs:
+    - job: 'build-stable'
+      artifacts: false
   rules:
     - if: $CI_PIPELINE_SOURCE == "schedule"
   script:
@@ -430,6 +477,9 @@ coverage:
     - '.cargo test'
     - .img-stable
   stage: 'extras'
+  needs:
+    - job: 'build-stable'
+      artifacts: false
   variables:
     ALL_FEATURES: 'yes'
     RUSTFLAGS: "-Cinstrument-coverage"
@@ -454,6 +504,9 @@ doc-stripping:
     GIT_SUBMODULE_STRATEGY: recursive
   extends: .img-nightly
   stage: 'extras'
+  needs:
+    - job: 'build-nightly'
+      artifacts: false
   script:
     - PATH=~/.cargo/bin/:$PATH ./generator.py --gir-files-directories gir-files gst-gir-files --strip-docs --no-fmt
     - git diff --quiet || (echo 'Files changed after running `rustdoc-stripper -s`, make sure all documentation is protected with `// rustdoc-stripper-ignore-next`!'; git diff; false)
@@ -463,6 +516,9 @@ docs:
     GIT_SUBMODULE_STRATEGY: recursive
   extends: .img-nightly
   stage: 'extras'
+  needs:
+    - job: 'build-nightly'
+      artifacts: false
   script:
     - curl --proto '=https' --tlsv1.2 -sSf -o gir-rustdoc.py
         https://gitlab.gnome.org/World/Rust/gir-rustdoc/-/raw/main/gir-rustdoc.py
@@ -484,8 +540,8 @@ docs:
 pages:
   extends: .img-nightly
   stage: 'deploy'
-  dependencies:
+  needs: [ 'docs' ]
-    - docs
+  interruptible: false
   script:
     - curl --proto '=https' --tlsv1.2 -sSf -o gir-rustdoc.py
         https://gitlab.gnome.org/World/Rust/gir-rustdoc/-/raw/main/gir-rustdoc.py