CI: update to Ubuntu 22.04

We need to explicitly install python2, since it is no longer the default.

Eventually we may want to drop this completely, but we're not there yet.

Signed-off-by: Edwin Török <edwin.torok@cloud.com>

.github/workflows/main.yml

@@ -117,7 +117,7 @@ jobs:
 
   ocaml-tests:
     name: Run OCaml tests
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     env:
       # Ensure you also update test-sdk-builds
       # when changing this value, to keep builds
@@ -158,7 +158,7 @@ jobs:
 
   deprecation-test:
     name: Deprecation tests
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Checkout code

.github/workflows/setup-xapi-environment/action.yml

@@ -31,6 +31,10 @@ runs:
       shell: bash
       run: sudo apt-get update
 
+    - name: Install python2
+      shell: bash
+      run: sudo apt-get install python2
+
     - name: Use disk with more space for TMPDIR and XDG_CACHE_HOME
       shell: bash
       run: |