GitHub Actions now supports skipping tests

https://github.blog/changelog/2021-02-08-github-actions-skip-pull-request-and-push-workflows-with-skip-ci/

> GitHub Actions now supports skipping push and pull_request workflows by
> looking for some common keywords in your commit message.
>
> If any commit message in your push or the HEAD commit of your PR
> contains the strings [skip ci], [ci skip], [no ci], [skip actions], or
> [actions skip] workflows triggered on the push or pull_request events
> will be skipped.

.github/workflows/check_changelog.yml

@@ -10,8 +10,6 @@ jobs:
     if: |
       !(   contains(github.event.pull_request.title, '[changelog skip]')
         || contains(github.event.pull_request.title, '[skip changelog]')
-        || contains(github.event.pull_request.title, '[ci skip]')
-        || contains(github.event.pull_request.title, '[skip ci]'))
 
     steps:
     - uses: actions/checkout@v1

.github/workflows/mri.yml

@@ -11,11 +11,6 @@ jobs:
       TESTOPTS: -v
 
     runs-on: ${{ matrix.os }}
-    if: |
-      !(   contains(github.event.pull_request.title,  '[ci skip]')
-        || contains(github.event.pull_request.title,  '[skip ci]')
-        || contains(github.event.head_commit.message, '[ci skip]')
-        || contains(github.event.head_commit.message, '[skip ci]'))
     strategy:
       fail-fast: false
       matrix:

.github/workflows/non_mri.yml

@@ -11,11 +11,6 @@ jobs:
       TESTOPTS: -v
 
     runs-on: ${{ matrix.os }}
-    if: |
-      !(   contains(github.event.pull_request.title,  '[ci skip]')
-        || contains(github.event.pull_request.title,  '[skip ci]')
-        || contains(github.event.head_commit.message, '[ci skip]')
-        || contains(github.event.head_commit.message, '[skip ci]'))
     strategy:
       fail-fast: false
       matrix: