Support charmcraft 3 (#31)

.github/workflows/check.yaml

@@ -102,7 +102,7 @@ jobs:
         with:
           provider: "lxd"
           juju-channel: ${{ matrix.juju-channel }}
-          charmcraft-channel: "2.x/stable"
+          charmcraft-channel: "3.x/stable"
 
       - name: Enabled nested LXD containers
         run: |

.github/workflows/promote.yaml

@@ -31,4 +31,4 @@ jobs:
           credentials: ${{ secrets.CHARMHUB_TOKEN }}
           destination-channel: ${{ steps.set-channels.outputs.destination-channel }}
           origin-channel: ${{ steps.set-channels.outputs.origin-channel }}
-          charmcraft-channel: "2.x/stable"
+          charmcraft-channel: "3.x/stable"

.github/workflows/release.yaml

@@ -31,7 +31,7 @@ jobs:
       - name: Pack and upload to charmhub
         uses: canonical/charming-actions/upload-charm@2.6.2
         with:
-          charmcraft-channel: "2.x/stable"
+          charmcraft-channel: "3.x/stable"
           credentials: "${{ secrets.CHARMHUB_TOKEN }}"
           github-token: "${{ secrets.GITHUB_TOKEN }}"
           # Ensure the charm is built in an isolated environment and on the correct base in an lxd container.

charmcraft.yaml

@@ -1,15 +1,10 @@
 type: charm
-bases:
-  - build-on:
-    - name: ubuntu
-      channel: "22.04"
-      architectures: ["amd64"]
-    run-on:
-      - name: ubuntu
-        channel: "22.04"
-        architectures:
-          - amd64
-      - name: ubuntu
-        channel: "20.04"
-        architectures:
-          - amd64
+
+parts:
+  charm:
+    plugin: charm
+    source: .
+
+platforms:
+  ubuntu@20.04:amd64:
+  ubuntu@22.04:amd64:

tests/functional/test_charm.py

@@ -1,4 +1,5 @@
 import logging
+import os
 
 import pytest
 
@@ -9,7 +10,7 @@
 @pytest.mark.skip_if_deployed
 async def test_build_and_deploy(ops_test, series):
     """Build simple-stream charm and deploy it in bundle."""
-    simple_stream_charm = await ops_test.build_charm(".")
+    simple_stream_charm = os.environ.get(f"CHARM_PATH_{series.upper()}")
 
     await ops_test.model.deploy(
         ops_test.render_bundle(