.github/workflows/build_charm.yaml

@@ -87,12 +87,6 @@ jobs:
     runs-on: ${{ matrix.platform.runner }}
     timeout-minutes: 120
     steps:
-      - name: (GitHub-hosted ARM runner) Install libpq-dev
-        if: ${{ matrix.platform.runner == 'Ubuntu_ARM64_4C_16G_02' }}
-        # Needed for `charmcraftcache` to resolve dependencies (for postgresql charms with psycopg2)
-        run: |
-          sudo apt-get update
-          sudo apt-get install libpq-dev -y
       - name: Get workflow version
         id: workflow-version
         uses: canonical/get-workflow-version-action@v1
@@ -128,9 +122,6 @@ jobs:
           sudo iptables -P FORWARD ACCEPT
 
           sudo snap install charmcraft --classic ${{ steps.charmcraft-snap-version.outputs.install_flag }}
-          pipx install poetry
-          pipx inject poetry poetry-plugin-export
-
           pipx install charmcraftcache
       - run: snap list
       - name: Pack charm

python/cli/data_platform_workflows_cli/craft_tools/collect_platforms.py

@@ -73,8 +73,15 @@ def collect(craft_: craft.Craft):
                 platforms.append({"name": platform, "runner": RUNNERS[architecture]})
         elif yaml_data["base"] == "core22":
             for entry in yaml_data["architectures"]:
+                # Example: ["amd64"]
+                platforms_ = entry["build-on"]
+                if not (isinstance(platforms_, list) and len(platforms_) == 1):
+                    raise ValueError(
+                        "Expected snapcraft.yaml 'build-on' value with type 'list' and length 1, "
+                        f"got: {repr(platforms_)}"
+                    )
                 # Example: "amd64"
-                platform = entry["build-on"]
+                platform = platforms_[0]
                 architecture = craft.Architecture(platform)
                 platforms.append({"name": platform, "runner": RUNNERS[architecture]})
         else: