Fix a docker rebuild issue (#88)

The Docker build wasn't making use of docker's cache because the .git directory was being copied into the build context. This means that even if the app did not change, if anything in git changed then docker would rebuild the entire app.

This excludes the .git folder from the docker build, instead relying on the user to pass in the build hash at build time. Which is annoying but I don't think there's a better way around it.

This was annoying me because I am deploying a self-hosted version of flotilla from a git branch via ansible and it was rebuilding flotilla every time.

Co-authored-by: mplorentz <mplorentz@noreply.gitea.coracle.social>
Reviewed-on: #88
Co-authored-by: Matt Lorentz <mplorentz@noreply.coracle.social>
Co-committed-by: Matt Lorentz <mplorentz@noreply.coracle.social>

README.md

@@ -11,7 +11,7 @@ You can also optionally create an `.env` file and populate it with the following
 - `VITE_DEFAULT_PUBKEYS` - A comma-separated list of hex pubkeys for bootstrapping web of trust
 - `VITE_PLATFORM_URL` - The url where the app will be hosted
 - `VITE_PLATFORM_NAME` - The name of the app
-- `VITE_PLATFORM_LOGO` - A logo url for the app
+- `VITE_PLATFORM_LOGO` - A logo url for the app. Can be a local path or https link. Must be a PNG file.
 - `VITE_PLATFORM_RELAYS` - A list of comma-separated relay urls that will make flotilla operate in "platform mode". Disables all space browse/add/select functionality and makes the first platform relay the home page.
 - `VITE_PLATFORM_ACCENT` - A hex color for the app's accent color
 - `VITE_PLATFORM_DESCRIPTION` - A description of the app