tailscale: add support for auth key secrets

The secrets support here is intended for codespaces where the
TS_AUTH_KEY environment variable is protected by github secrets. Setting
an auth key via the environment in other devcontainer runtimes may pose
additonal security risks associated with secrets in environment
variables.

Fix sudo passing environment for firewall mode (#34)

* src/tailscale: pass firewall mode through sudo

* src/tailscale: bump to 1.0.6 for sudo env fix

Prepare for 1.0.5 release (#33)

* src/tailscale: update version string for next release

* README.md: add version parameter to example configuration

Update scripts to be sh compatible (#22)

update templates-namespace

The 1.0.2 version went to both the original namespace
https://github.com/tailscale/codespace/pkgs/container/codespace%2Ftailscale

and to the new, and intended, namespace:
https://github.com/tailscale/codespace/pkgs/container/codespace

Most importantly, the 1.0.2 tag only appears in the original namespace,
and we want it to appear in the new namespace.

Add a templates-namespace declaration, maybe the original namespace is
being used because of the template.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>

Increment semver for new namespace.

I thought that changing the namespace meant it wouldn't find
1.0.1 and would publish it to the new location, but no.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>

Increment semver for 1.36.2.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>