fix(ci): move actions from snapcore to canonical (#1916)

The `snapcore/action-publish` action no longer has tags, so we need to
switch it over. Might as well do the build one too.

.github/workflows/tests.yaml

@@ -127,7 +127,7 @@ jobs:
  with:
  fetch-depth: 0
  - name: Build snap
- uses: snapcore/action-build@v1
+ uses: canonical/action-build@v1
  id: snapcraft
  - name: Upload snap artifact
  uses: actions/upload-artifact@v4
@@ -152,7 +152,7 @@ jobs:
  fi
  - name: Publish feature branch to edge/${{ steps.vars.outputs.branch }}
  if: ${{ env.SNAPCRAFT_STORE_CREDENTIALS != '' }}
- uses: snapcore/action-publish@v1
+ uses: canonical/action-publish@v1
  env:
  SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
  with: