ci: add Linux installation QA workflow for .deb and .rpm packages

[Benoît Cortier (CBenoit)]

Adds a separate reusable workflow (.github/workflows/linux-install-test.yml)
that installs the devolutions-gateway packages produced by ci.yml inside
Docker containers and verifies the filesystem layout, binary executability,
and service registration artifacts.

• DEB lane: ubuntu:18.04 container
• RPM lane: rockylinux:9 container (RHEL 9-compatible)
• Triggers: workflow_call, workflow_dispatch, weekly schedule (Monday 06:00 UTC)
• Consumes the devolutions-gateway artifact from ci.yml; resolves run ID
  automatically for scheduled/manual triggers via the GitHub API
• Integrated into create-new-release.yml to run in parallel with packaging

[Copilot]

Pull request overview

Adds a dedicated GitHub Actions workflow to smoke-test the Linux .deb and .rpm artifacts produced by ci.yml, and wires it into the release pipeline so Linux package install regressions are caught before signing/release.

Changes:

• Introduce a reusable linux-install-test.yml workflow that downloads CI artifacts and runs install checks in Docker (DEB + RPM lanes).
• Add DEB/RPM smoke-test scripts plus a shared bash helper library to validate install, expected filesystem layout, basic CLI functionality, and (best-effort) service setup.
• Update create-new-release.yml to require Linux install tests to pass before release.yml runs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/linux-install-test.yml	New reusable workflow to download CI artifacts and run containerized DEB/RPM install smoke tests.
.github/workflows/create-new-release.yml	Gates release workflow on Linux install tests (runs in parallel with packaging).
.github/scripts/smoke-test-deb.sh	New DEB install smoke test script (Ubuntu container lane).
.github/scripts/smoke-test-rpm.sh	New RPM install smoke test script (Rocky Linux container lane).
.github/scripts/smoke-test-lib.sh	Shared helper functions for Linux package smoke tests.

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[Copilot]

Pull request overview

Adds a reusable GitHub Actions workflow to smoke-test the Linux .deb and .rpm packages produced by ci.yml, and wires it into the release pipeline to catch packaging/install regressions before signing/release.

Changes:

• Introduce linux-install-test.yml reusable workflow (manual/scheduled/callable) that downloads CI artifacts and runs install checks in Docker containers.
• Add shared DEB/RPM smoke-test scripts (plus shared library) to validate install, file layout, basic binary behavior, config init, and best-effort service checks.
• Gate create-new-release.yml’s release job on the new Linux install test workflow.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/linux-install-test.yml	New reusable workflow that selects a CI run, downloads artifacts/version, runs DEB+RPM install smoke tests in containers, and notifies Slack on scheduled failure.
.github/workflows/create-new-release.yml	Adds Linux install test as a prerequisite before running the release workflow.
.github/scripts/smoke-test-deb.sh	New Ubuntu-based .deb install smoke test script (uses shared checks + deb-specific diagnostics).
.github/scripts/smoke-test-rpm.sh	New Rocky-based .rpm install smoke test script (uses shared checks + rpm-specific diagnostics).
.github/scripts/smoke-test-lib.sh	Shared helper library implementing common checks and summary reporting.

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