Initialize 1.31 release (#4712)

Author: berkayoz

.github/workflows/build-snap.yml

@@ -1,7 +1,7 @@
 name: Build and test MicroK8s snap
 
 on:
-  - push
+  - pull_request
 
 jobs:
   build:
@@ -56,7 +56,7 @@ jobs:
           path: build
       - name: Running upgrade path test
         run: |
-          sudo -E STRICT=yes UPGRADE_MICROK8S_FROM=latest/edge/strict UPGRADE_MICROK8S_TO=$PWD/build/microk8s.snap pytest -s ./tests/test-upgrade-path.py
+          sudo -E STRICT="yes" UPGRADE_MICROK8S_FROM=1.31-strict/edge UPGRADE_MICROK8S_TO=$PWD/build/microk8s.snap pytest -s ./tests/test-upgrade-path.py
 
   test-addons-core:
     name: Test core addons
@@ -152,7 +152,7 @@ jobs:
           set -x
           export UNDER_TIME_PRESSURE="True"
           export STRICT="yes"
-          sudo -E bash -c "UPGRADE_MICROK8S_FROM=latest/edge/strict UPGRADE_MICROK8S_TO=$PWD/build/microk8s.snap pytest -s ./tests/test-upgrade.py"
+          sudo -E bash -c "UPGRADE_MICROK8S_FROM=1.31-strict/edge UPGRADE_MICROK8S_TO=$PWD/build/microk8s.snap pytest -s ./tests/test-upgrade.py"
 
   test-cluster-agent:
     name: Cluster agent health check

build-scripts/addons/repositories.sh

@@ -3,8 +3,8 @@
 # List of addon repositories to bundle in the snap
 # (name),(repository),(reference)
 ADDONS_REPOS="
-core,https://github.com/canonical/microk8s-core-addons,main
-community,https://github.com/canonical/microk8s-community-addons,main
+core,https://github.com/canonical/microk8s-core-addons,1.31
+community,https://github.com/canonical/microk8s-community-addons,1.31
 "
 
 # List of addon repositories to automatically enable

build-scripts/components/cluster-agent/version.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
 
-echo "main"
+echo "1.31"

build-scripts/components/kubernetes/version.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-KUBE_TRACK="${KUBE_TRACK:-}"            # example: "1.24"
+KUBE_TRACK="${KUBE_TRACK:-1.31}"            # example: "1.24"
 KUBE_VERSION="${KUBE_VERSION:-}"        # example: "v1.24.2"
 
 if [ -z "${KUBE_VERSION}" ]; then