Pin charmcraft channel to 3.1/stable (#565)

* Pin charmcraft channel

* Update .github/workflows/integrate.yaml

Co-authored-by: Daniela Plascencia <daniela.plascencia@canonical.com>

* Add comment above the pinning to link to the proper issue

* Pin to 3.x instead of 3.1 which doesn't exist as a track

---------

Co-authored-by: Daniela Plascencia <daniela.plascencia@canonical.com>

Author: mvlassis

.github/workflows/integrate.yaml

@@ -98,7 +98,8 @@ jobs:
           provider: microk8s
           channel: 1.29-strict/stable
           juju-channel: 3.4/stable
-          charmcraft-channel: latest/candidate
+          # Pinned to 3.x/stable due to https://github.com/canonical/charmcraft/issues/1845
+          charmcraft-channel: 3.x/stable
 
       - name: Integration tests
         run: |
@@ -139,7 +140,8 @@ jobs:
           provider: microk8s
           channel: 1.29-strict/stable
           juju-channel: 3.4/stable
-          charmcraft-channel: latest/candidate
+          # Pinned to 3.x/stable due to https://github.com/canonical/charmcraft/issues/1845
+          charmcraft-channel: 3.x/stable
           microk8s-addons: "dns hostpath-storage rbac metallb:10.64.140.43-10.64.140.49"
 
       - name: Run test

.github/workflows/publish.yaml

@@ -91,4 +91,5 @@ jobs:
           charm-path: ${{ matrix.charm-path }}
           channel: ${{ steps.parse-inputs.outputs.destination_channel }}
           tag-prefix: ${{ steps.parse-inputs.outputs.tag_prefix }}
-          charmcraft-channel: latest/candidate
+          # Pinned to 3.x/stable due to https://github.com/canonical/charmcraft/issues/1845
+          charmcraft-channel: 3.x/stable