fix: install keybase binary directly from deb to bypass unresolvable GUI dependencies on Ubuntu 24.04+

[Copilot]

The keybase .deb package declares GUI dependencies (libayatana-appindicator3-1, fuse, libasound2, libxss1, libxtst6, libgtk-3-0) that are renamed or absent in Ubuntu 24.04+, causing apt-get install to abort entirely. The package also bundles a large Electron GUI app at /opt/keybase/Keybase which exhausts the container's available disk space when extracted.

Changes

• src/keybase.io/install.sh: Replace apt-get install /tmp/keybase.deb with a streaming pipeline that extracts only the keybase CLI binary from the deb's embedded tar — without writing the large Electron GUI app or any other package contents to disk.

# Before — fails on Ubuntu 24.04+
DEBIAN_FRONTEND=noninteractive apt-get install -y "/tmp/${deb_file}"

# After — streams only the keybase binary, no dependency resolution, no disk exhaustion
dpkg-deb --fsys-tarfile "/tmp/${deb_file}" \
    | tar -xO ./usr/bin/keybase \
    | install -m 0755 /dev/stdin /usr/local/bin/keybase

The GUI libraries are irrelevant for CLI usage in a headless devcontainer. The Electron GUI app (/opt/keybase/Keybase) and all other package assets are discarded in the stream and never written to disk. KBFS/fuse-based features remain non-functional in containers regardless, so there is no regression. Pipeline failures (e.g. binary missing from the deb) are caught by the existing set -o pipefail at the top of the script.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Bug: feature keybase.io is not installable on Ubuntu</issue_title>
<issue_description>See:

https://github.com/devcontainer-community/devcontainer-features/actions/runs/23292760248/job/67741145094

Error:

devcontainer-community/devcontainer-features#13 2.211  keybase : Depends: libayatana-appindicator3-1 but it is not installable
devcontainer-community/devcontainer-features#13 2.211            Depends: fuse but it is not installable
devcontainer-community/devcontainer-features#13 2.211            Depends: libasound2 but it is not installable
devcontainer-community/devcontainer-features#13 2.211            Depends: libnss3 but it is not installable
devcontainer-community/devcontainer-features#13 2.211            Depends: libxss1 but it is not installable
devcontainer-community/devcontainer-features#13 2.211            Depends: libxtst6 but it is not installable
devcontainer-community/devcontainer-features#13 2.211            Depends: libgtk-3-0 but it is not installable
devcontainer-community/devcontainer-features#13 2.211 E: Unable to correct problems, you have held broken packages.
devcontainer-community/devcontainer-features#13 2.227 ERROR: Feature "keybase.io" (Unknown) failed to install! Look at the documentation at https://github.com/devcontainer-community/devcontainer-features/tree/main/src/keybase.io for help troubleshooting this error.
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Bug: feature keybase.io is not installable on Ubuntu #130

---

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[sebst]

Tests still failing:

[2026-03-19T12:50:20.871Z] #14 4.030 Setting up ca-certificates (20250419) ...
[2026-03-19T12:50:21.193Z] #14 4.502 Updating certificates in /etc/ssl/certs...
[2026-03-19T12:50:21.781Z] #14 5.090 150 added, 0 removed; done.
[2026-03-19T12:50:21.978Z] #14 5.104 Setting up libp11-kit0:amd64 (0.25.5-3) ...
#14 5.107 Setting up libgssapi-krb5-2:amd64 (1.21.3-5) ...
#14 5.110 Setting up libgnutls30t64:amd64 (3.8.9-3+deb13u2) ...
#14 5.112 Setting up libpsl5t64:amd64 (0.21.2-1.1+b1) ...
#14 5.115 Setting up librtmp1:amd64 (2.4+20151223.gitfa8646d.1-2+b5) ...
#14 5.118 Setting up libcurl4t64:amd64 (8.14.1-2+deb13u2) ...
#14 5.120 Setting up curl (8.14.1-2+deb13u2) ...
#14 5.123 Processing triggers for libc-bin (2.41-12+deb13u2) ...
[2026-03-19T12:50:21.978Z] 
#14 5.133 Processing triggers for ca-certificates (20250419) ...
#14 5.137 Updating certificates in /etc/ssl/certs...
[2026-03-19T12:50:22.299Z] #14 5.608 0 added, 0 removed; done.
#14 5.608 Running hooks in /etc/ca-certificates/update.d...
[2026-03-19T12:50:22.450Z] #14 5.609 done.
[2026-03-19T12:58:56.105Z] #14 519.4 tar: ./opt/keybase/Keybase: Wrote only 9216 of 10240 bytes

[Copilot]

Tests still failing:

The tar: ./opt/keybase/Keybase: Wrote only 9216 of 10240 bytes error was caused by dpkg-deb -x extracting the entire deb to disk — including the large Electron GUI app at /opt/keybase/Keybase — which exhausts the container's disk space.

Fixed in 8bef42e by piping dpkg-deb --fsys-tarfile through tar -xO ./usr/bin/keybase to stream only the keybase CLI binary out, never writing anything else to disk. The Electron app and all GUI assets are discarded in the stream before reaching storage.

[sebst]

need to bump minor version in devcontainer-feature.json

[Copilot]

need to bump minor version in devcontainer-feature.json

Done in a14bc9c — bumped version from 1.0.0 to 1.1.0.