vdoctor: error in V git status with packaged build

[lcheylus]

Describe the bug

With a packaged build of V (build from v4.0.10 sources, outside of Git worktree), there is an error for V git status in vdoctor output:

$ ./v -v version
V 0.4.10 9b1937a87166e3327497f332bf9584ff90592617.

$ ./v doctor
|V full version      |V 0.4.10 9b1937a87166e3327497f332bf9584ff90592617.
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux trixie/sid
(...)
|Git version         |git version 2.47.2
|V git status        |Error: fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
|.git/config present |false
(...)

Reproduction Steps

Build V 0.4.10 from sources

# Download packaged sources for V 0.4.10 and vc commit 66ea39be2275ac723225b9ca99d51ec1212c640d
$ wget https://github.com/vlang/v/archive/refs/tags/0.4.10.tar.gz -O v-0.4.10.tar.gz
$ wget https://github.com/vlang/vc/archive/66ea39be2275ac723225b9ca99d51ec1212c640d.tar.gz -O vc-66ea39be2275ac723225b9ca99d51ec1212c640d.tar.gz

# Extract sources for V 0.4.10
$ tar xzvf v-0.4.10.tar.gz
$ tar xzvf vc-66ea39be2275ac723225b9ca99d51ec1212c640d.tar.gz

$ cd v-0.4.10
$ mv ../vc-66ea39be2275ac723225b9ca99d51ec1212c640d ./vc

# Build with local sources
$ make local=1 prod=1
Using local vc
Using local tcc
The executable './thirdparty/tcc/tcc.exe' does not work.
cc  -std=gnu99 -w -o v1 ./vc/v.c -lm -lpthread  || cmd/tools/cc_compilation_failed_non_windows.sh
./v1 -no-parallel -o v2 -prod cmd/v
./v2 -nocache -o ./v -prod cmd/v
rm -rf v1 v2

# Output for V version
$ ./v version
V 0.4.10
$ ./v -v version
V 0.4.10 9b1937a87166e3327497f332bf9584ff90592617.

Expected Behavior

In vdoctor output, V git status = N/A

Current Behavior

See description above for "V Git status" error in vdoctor output.

Possible Solution

In cmd/tools/vdoctor.v, function git_info, check if we are in a Git worktree and returns N/A if not.

To check if we are in a Git worktree, we could use git rev-parse --is-inside-work-tree and check if output == true.

Additional Information/Context

No response

V version

V 0.4.10

Environment details (OS name and version, etc.)

OS = Linux Debian/testing on amd64

$ lsb_release -d -s
Debian GNU/Linux trixie/sid

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[huly-for-github]

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