Replace pipx with uv tool install

Use `uv tool install` instead of `pipx install` for bakery
installation. Update prerequisites to reference uv instead
of pipx.

Author: bschwedler

README.md

@@ -136,7 +136,7 @@ Additional documentation:
 Build prerequisites
 
 * [python](https://docs.astral.sh/uv/guides/install-python/)
-* [pipx](https://pipx.pypa.io/stable/installation/)
+* [uv](https://docs.astral.sh/uv/getting-started/installation/)
 * [docker buildx bake](https://github.com/docker/buildx#installing)
 * [just](https://just.systems/man/en/prerequisites.html)
 * [gh](https://github.com/cli/cli#installation) (required while repositories are private)

justfile

@@ -3,7 +3,7 @@
 install-bakery *OPTS:
   #!/bin/bash
   # TODO: Update this after package is published somewhere
-  pipx install {{OPTS}} 'git+ssh://git@github.com/posit-dev/images-shared.git@main#egg=posit-bakery&subdirectory=posit-bakery'
+  uv tool install {{OPTS}} 'git+ssh://git@github.com/posit-dev/images-shared.git@main#egg=posit-bakery&subdirectory=posit-bakery'
 
 install-goss:
   #!/bin/bash