[supervisor] Fix dotfile installation

[csweichel]

Description

This PR fixes dotfile installation in Gitpod workspaces.

Related Issue(s)

Fixes #8281

How to test

1. Set up a dotfile repo in the preferences
2. Start a workspace

Release Notes

NONE

[iQQBot]

LGTM

[codecov]

Codecov Report

Merging #8283 (8afd1a8) into main (bfc9ce4) will increase coverage by 19.30%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main    #8283       +/-   ##
===========================================
+ Coverage   12.31%   31.62%   +19.30%     
===========================================
  Files          20       37       +17     
  Lines        1161     5742     +4581     
===========================================
+ Hits          143     1816     +1673     
- Misses       1014     3789     +2775     
- Partials        4      137      +133     

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)
components-local-app-app-darwin-amd64	?
components-local-app-app-darwin-arm64	?
components-local-app-app-linux-amd64	?
components-local-app-app-linux-arm64	?
components-local-app-app-windows-386	?
components-local-app-app-windows-amd64	?
components-local-app-app-windows-arm64	?
components-supervisor-app	35.90% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/supervisor/pkg/supervisor/supervisor.go	6.47% <0.00%> (ø)
components/local-app/pkg/auth/auth.go
components/local-app/pkg/auth/pkce.go
components/supervisor/pkg/ports/slirp4netns.go	0.00% <0.00%> (ø)
components/supervisor/pkg/supervisor/ssh.go	0.00% <0.00%> (ø)
components/supervisor/pkg/supervisor/user.go	32.29% <0.00%> (ø)
components/supervisor/pkg/supervisor/config.go	4.23% <0.00%> (ø)
components/supervisor/pkg/dropwriter/dropwriter.go	73.46% <0.00%> (ø)
components/supervisor/pkg/config/gitpod-config.go	76.78% <0.00%> (ø)
components/supervisor/pkg/supervisor/git.go	0.00% <0.00%> (ø)
... and 12 more

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