ci: Pin runners to ubuntu 22.04

.github/workflows/check-doc.yml

@@ -9,7 +9,7 @@ on:
 jobs:
 
   test_doc:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python

.github/workflows/dockerhub.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -19,7 +19,7 @@ jobs:
         run: docker compose -f docker-compose.test.yml run sut
 
   build_upload:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: test
     if: github.event_name != 'pull_request'
     steps:

.github/workflows/lint-and-tests.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
@@ -27,7 +27,7 @@ jobs:
   test:
     # Dependency on linting to avoid running our expensive matrix test for nothing
     needs: lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     # Use postgresql and MariaDB versions of Debian bookworm
     services:
       postgres: