ci: update to ubuntu-22.04 from deprecated ubuntu-20.04

Ubuntu 20.04 is deprecated and has limited support.
Using ubuntu-22.04 for better compatibility and support.

.forgejo/workflows/build.yaml

@@ -15,7 +15,7 @@ concurrency:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     services:
       postgres:
         image: timescale/timescaledb:latest-pg17
@@ -76,7 +76,7 @@ jobs:
           DATABASE_URL: postgresql://postgres:postgres@localhost:5432/towerops_test
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: test
     steps:
       - name: Checkout code