ci(build-tauri): expose Linux AppImage and deb as standalone release artifacts

[TimeToBuildBob]

Fixes #1300.

Problem

After make package, aw-tauri already builds an .AppImage and .deb — these land inside dist/activitywatch/aw-tauri/ (and end up zipped inside the .zip release). But the Upload step only picks up files matching dist/activitywatch-*.*, so the AppImage and deb were never exposed as standalone downloadable artifacts in CI or releases.

The macOS workflow already has a dedicated "Package dmg" step that moves the .dmg to dist/ with the right name. Linux had no equivalent.

Fix

Add a Linux-specific step (mirroring "Package dmg") that copies the AppImage and deb out to dist/ using the standard naming convention:

dist/activitywatch-tauri-<version>-linux-<arch>.AppImage
dist/activitywatch-tauri-<version>-linux-<arch>.deb

These then get picked up by the existing Upload packages step and included in releases.

Test plan

• CI on this PR shows both activitywatch-tauri-*-linux-x86_64.AppImage and .deb in the uploaded artifacts for the ubuntu runners
• ARM build similarly produces aarch64 variants

[greptile-apps]

Greptile Summary

This PR adds a Linux-specific CI step that copies the aw-tauri-produced .AppImage and .deb files from dist/activitywatch/aw-tauri/ into dist/ under the standard activitywatch-tauri-<version>-linux-<arch> naming convention, mirroring what the existing "Package dmg" step does for macOS.

• The new step runs after make package and before "Upload packages", ensuring both Linux artifact types are picked up by the existing dist/activitywatch-*.* glob and exposed as standalone downloadable artifacts in CI and releases.
• find ... | head -1 is used for discovery; if no AppImage is found a warning is printed, but if no .deb is found the block exits silently — a minor inconsistency compared to the AppImage branch.
• The step never exits non-zero when artifacts are absent, so a regression in make package that stops producing these files would not be caught by CI.

Confidence Score: 4/5

Safe to merge; the change is additive and only affects the Linux packaging step — no existing behavior is modified.

The copy logic is straightforward and mirrors the existing macOS dmg step. The two nits (missing else-branch warning for deb, no non-zero exit when artifacts are absent) are easy to address but won't break current builds or releases.

.github/workflows/build-tauri.yml — specifically the deb discovery block and the overall step exit behavior.

Important Files Changed

Filename	Overview
.github/workflows/build-tauri.yml	Adds a Linux-only step that copies the aw-tauri-produced AppImage and .deb into dist/ so the existing Upload step exposes them as standalone artifacts. One minor asymmetry: the .deb block has no else-branch warning when no file is found, unlike the AppImage block.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Package step\nmake package] --> B{runner.os}
    B -- macOS --> C[Package dmg step\nbuild + sign + notarize\nmv to dist/activitywatch-tauri-VERSION-macos-ARCH.dmg]
    B -- Linux --> D[Package AppImage and deb step\nfind dist/activitywatch/aw-tauri/]
    B -- Windows --> E[no extra step]
    D --> F{AppImage found?}
    F -- yes --> G[cp to dist/activitywatch-tauri-VERSION-linux-ARCH.AppImage]
    F -- no --> H[echo Warning, continue]
    D --> I{deb found?}
    I -- yes --> J[cp to dist/activitywatch-tauri-VERSION-linux-ARCH.deb]
    I -- no --> K[silent, no warning]
    G --> L[Upload packages\ndist/activitywatch-*.*]
    J --> L
    H --> L
    C --> L
    E --> L
    K --> L

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[TimeToBuildBob]

Superseded by #1302, which also handles .rpm and uses nullglob for cleaner no-op behavior when bundles are absent.