chore: install Multipass in all Linux arm64 workflow builds

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Summary by cubic

Install Multipass in all Linux arm64 GitHub Actions workflows so Snapcraft can provision build VMs. This fixes arm64 snap builds failing due to missing Multipass and aligns prod/stage configs across agent, desktop, timer, and server pipelines.

^{Written for commit f51b7ff. Summary will update automatically on new commits.}

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[greptile-apps]

Greptile Summary

This PR adds Multipass installation to all 12 Linux arm64 workflow builds (agent, desktop-app, desktop-timer-app, server-api, server-mcp, and server for both prod and stage environments).

• Multipass is installed via sudo snap install multipass after Snapcraft installation
• This change targets only the release-linux-arm64 job in each workflow
• Multipass is a Canonical tool used to create Ubuntu VMs, commonly needed for building snap packages in clean environments on arm64 architecture

Confidence Score: 5/5

• This PR is safe to merge - it adds a standard dependency installation step to CI workflows.
• The change is minimal, consistent across all files, and follows the existing pattern of installing build dependencies. Multipass is a well-known Canonical tool that complements Snapcraft for building snaps.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/agent-prod.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/agent-stage.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/desktop-app-prod.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/desktop-app-stage.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/desktop-timer-app-prod.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/desktop-timer-app-stage.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/server-api-prod.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/server-api-stage.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/server-mcp-prod.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/server-mcp-stage.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/server-prod.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.
.github/workflows/server-stage.yml	Added Multipass installation step for Linux arm64 builds to support snap package building.

Sequence Diagram

sequenceDiagram
    participant GH as GitHub Actions
    participant Runner as ubicloud-standard-16-arm
    participant Snap as Snapcraft
    participant MP as Multipass

    GH->>Runner: Trigger release-linux-arm64 job
    Runner->>Runner: Checkout, setup Node.js
    Runner->>Runner: Install system dependencies
    Runner->>Snap: Install Snapcraft (action-snapcraft@v2)
    Runner->>MP: Install Multipass (snap install multipass)
    Runner->>Runner: Continue with build steps
    Runner->>Runner: Build application for arm64

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[cubic-dev-ai]

No issues found across 12 files