CI: Use ubuntu-slim for lightweight CI jobs

.github/workflows/build.yml

@@ -23,7 +23,7 @@ concurrency:
 jobs:
   changes:
     name: Detect relevant changes
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     outputs:
       relevant: ${{ steps.filter.outputs.relevant }}
     steps:
@@ -155,7 +155,7 @@ jobs:
     name: ${{ matrix.name }}
     needs: changes
     if: needs.changes.outputs.relevant != 'true' && github.event_name != 'workflow_dispatch'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     strategy:
       matrix:
         include:

.github/workflows/check-links.yml

@@ -21,7 +21,7 @@ permissions:
 jobs:
   check_links:
     name: Check Links
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     if: github.repository == 'GenericMappingTools/gmt'
 
     steps:

.github/workflows/code-validator.yml

@@ -22,7 +22,7 @@ name: Code Validator
 jobs:
   changes:
     name: Detect relevant changes
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     outputs:
       relevant: ${{ steps.filter.outputs.relevant }}
     steps:
@@ -43,7 +43,7 @@ jobs:
     name: Code Validator
     needs: changes
     if: needs.changes.outputs.relevant == 'true' || github.event_name == 'workflow_dispatch'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Check out repository
         uses: actions/checkout@v6.0.2

.github/workflows/docker.yml

@@ -28,7 +28,7 @@ concurrency:
 jobs:
   changes:
     name: Detect relevant changes
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     permissions:
       contents: read
       pull-requests: read  # required by dorny/paths-filter on pull_request events

.github/workflows/release-drafter.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   update_release_draft:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       # Drafts your next Release notes as Pull Requests are merged into "master"
       - uses: release-drafter/release-drafter@v7.7.0

.github/workflows/remind.yml

@@ -18,7 +18,7 @@ permissions:
 jobs:
   review-known-failures:
     name: Review Known Failures
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
 
     steps:
     - name: Checkout

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ concurrency:
 jobs:
   changes:
     name: Detect relevant changes
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     outputs:
       relevant: ${{ steps.filter.outputs.relevant }}
     steps:
@@ -213,7 +213,7 @@ jobs:
     name: ${{ matrix.name }}
     needs: changes
     if: needs.changes.outputs.relevant != 'true' && github.event_name != 'workflow_dispatch'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     strategy:
       matrix:
         include:

.github/workflows/welcome.yml

@@ -19,7 +19,7 @@ permissions:
 jobs:
   greeting:
     name: Greet First-Time Contributors
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
 
     steps:
       - uses: actions/first-interaction@v3.1.0