Snap package: strict core24 snap on every release, optional Snap Store upload (#413)

* Snap package: build, test and attach a strict snap to every release packaging/linux/snap/snapcraft.yaml (core24, strict, gnome extension) repackages the release's Linux tarball like the Flatpak does. The release workflow builds it for amd64 and arm64, installs it with --dangerous, models a box in the confined app on headless X11 and Wayland, and attaches solidcraft-<version>-linux-<arch>.snap plus the version-less copy. When SNAPCRAFT_STORE_CREDENTIALS is set, nightlies go to edge and release drafts to candidate, and snap-store.yml promotes candidate to stable when a release is published. The README gets a Snap badge and install line. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT * snap smoke: stop the app's whole process group, refuse a busy control port Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT * snap smoke: quit the app cleanly between backends Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-12 18:07:26 -04:00
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+# Publishing a GitHub release (not a prerelease) promotes the snaps that release.yml uploaded to
+# the Snap Store's candidate channel to stable, so `sudo snap install solidcraft` gets it.
+# Skipped until the owner adds the SNAPCRAFT_STORE_CREDENTIALS secret; see docs/releasing.md.
+name: Snap Store
+
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: snap-store
+  cancel-in-progress: false
+
+jobs:
+  promote:
+    runs-on: ubuntu-latest
+    steps:
+      - id: creds
+        name: Check for Snap Store credentials
+        env:
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
+        run: |
+          if [ -n "$SNAPCRAFT_STORE_CREDENTIALS" ]; then
+            echo "configured=true" >>"$GITHUB_OUTPUT"
+          else
+            echo "No SNAPCRAFT_STORE_CREDENTIALS secret: nothing to promote."
+          fi
+      - name: Promote candidate to stable
+        if: steps.creds.outputs.configured == 'true'
+        env:
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
+        run: |
+          sudo snap install snapcraft --classic
+          snapcraft status solidcraft
+          snapcraft promote solidcraft --from-channel=latest/candidate --to-channel=latest/stable --yes
+          snapcraft status solidcraft