ci: pin runner version to Ubuntu 22.04

Pin the GitHub runner version used to Ubuntu 22.04.

This endures stability in the runner behavior once GitHub switches to
the next Ubuntu release for the latest tag.

Signed-off-by: David Bauer <mail@david-bauer.net>

.github/workflows/backport.yml

@@ -9,7 +9,7 @@ jobs:
   backport:
     name: Backport Pull Request
     if: github.repository_owner == 'freifunk-gluon' && github.event.pull_request.merged == true && (github.event_name != 'labeled' || startsWith('backport', github.event.label.name))
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Create backport PRs

.github/workflows/build-container.yml

@@ -16,7 +16,7 @@ env:
 
 jobs:
   build-and-push-image:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     permissions: write-all
     steps:
       - name: Checkout repository

.github/workflows/build-docs.yml

@@ -15,7 +15,7 @@ permissions:
 jobs:
   build-documentation:
     name: docs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Install Dependencies

.github/workflows/build-gluon.yml

@@ -17,7 +17,7 @@ jobs:
     permissions:
       contents: read  # for dorny/paths-filter to fetch a list of changed files
       pull-requests: read  # for dorny/paths-filter to read pull requests
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     outputs:
       targets: ${{ steps.filter.outputs.changes }}
     steps:
@@ -37,7 +37,7 @@ jobs:
       matrix:
         # Read back changed targets to create build matrix
         target: ${{ fromJSON(needs.changed.outputs.targets) }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/check-ci.yml

@@ -9,7 +9,7 @@ permissions:
 jobs:
   check-ci:
     name: Check generated CI
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Install example site

.github/workflows/check-patches.yml

@@ -18,7 +18,7 @@ permissions:
 jobs:
   check-patches:
     name: Check patches
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Refresh patches

.github/workflows/labels.yml

@@ -12,7 +12,7 @@ jobs:
     permissions:
       contents: read  # for actions/labeler to determine modified files
       pull-requests: write  # for actions/labeler to add labels to PRs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository_owner == 'freifunk-gluon'
     steps:
     - uses: actions/labeler@v4

.github/workflows/lint.yml

@@ -9,7 +9,7 @@ permissions:
 jobs:
   lua:
     name: Lua
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Install Dependencies
@@ -21,7 +21,7 @@ jobs:
 
   sh:
     name: Shell
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Install Dependencies
@@ -33,7 +33,7 @@ jobs:
 
   editorconfig:
     name: Editorconfig
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - name: Install Dependencies