ci(release): fix Ubuntu Snap canary install and registration (#1699)

Install the Snap built by the triggering Release Dev workflow by setting
merge-multiple: true on the artifact download. actions/download-artifact
otherwise extracts each artifact into its own subdirectory, leaving the
package at release/snap-linux-amd64/*.snap, so the install glob
./release/*.snap matched nothing. Merging flattens the artifact's contents
directly into release/ where the dangerous local snap install expects it.

Harden the Snap canary setup by enabling snapd.socket, waiting for snap
seeding (snap wait system seed.loaded), and running every step with strict
shell options (set -euo pipefail) so failures surface immediately.

Register the snapped gateway with the CLI as the documented local plaintext
snap-docker gateway, and print version and snap services, before running
openshell status so the canary verifies a configured and reachable gateway
instead of only the install.

Signed-off-by: Kris Hicks <khicks@nvidia.com>

Author: krishicks

.github/workflows/release-canary.yml

@@ -153,12 +153,16 @@ jobs:
     steps:
       - name: Install snapd
         run: |
+          set -euo pipefail
           sudo apt-get update
           sudo apt-get install -y snapd
+          sudo systemctl enable --now snapd.socket
           sudo systemctl start snapd
+          sudo snap wait system seed.loaded
 
       - name: Install Docker snap
         run: |
+          set -euo pipefail
           sudo snap install docker
 
       - name: Download snap from release-dev artifacts
@@ -167,20 +171,28 @@ jobs:
           run-id: ${{ github.event.workflow_run.id }}
           pattern: snap-linux-amd64
           path: release/
+          merge-multiple: true
 
       - name: Install snap (dangerous — from release, not store)
         run: |
+          set -euo pipefail
           sudo snap install ./release/*.snap --dangerous
 
       - name: Connect interfaces
         run: |
+          set -euo pipefail
           sudo snap connect openshell:docker docker:docker-daemon
           sudo snap connect openshell:log-observe
           sudo snap connect openshell:system-observe
           sudo snap connect openshell:ssh-keys
 
-      - name: Check status
+      - name: Register snap gateway and check status
         run: |
+          set -euo pipefail
+          openshell --version
+          sudo snap services openshell
+          openshell gateway add http://127.0.0.1:17670 --local --name snap-docker
+          openshell gateway select snap-docker
           openshell status
 
   kubernetes: