Merge pull request #181 from tailscale/mpminardi/windows-unattended-mode

{.github/workflows,action.yml}: run windows in unattended mode

Merge pull request #181 from tailscale/mpminardi/windows-unattended-mode

{.github/workflows,action.yml}: run windows in unattended mode

Merge pull request #178 from tailscale/max/add-retry

action: add retry on tailscale up to make the action more reliable

action.yml: properly remove temporary files after downloading

Remove `.tgz` and `.msi` files after they have been downloaded. This was
the behaviour of the action previous to `v3.2.0`, but our logic for
caching removed the deletion of these files.

Can look at downloading these to temp folders to avoid the more complex
logic here as a follow up, but this should unblock / fix the immediate
regression.

Also, on Windows, write `tailscale.log` to the temp dir.

Also, on MacOS, delete the `tailscale` directory that was used to build the `tailscale(d)` commands.

Updates: #170

Co-authored-by: Mario Minardi <mario@tailscale.com>
Signed-off-by: Percy Wegmann <percy@tailscale.com>

Merge pull request #169 from tailscale/mpminardi/document-use-cache

README.md: document the `use-cache` input

Merge pull request #161 from tailscale/mpminardi/mac-support

{action.yml,.github}: add support for macOS

Release v2.

Ensure curl calls follow redirects. (#86)

Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>