fix: tailscale static builds

Moving to new toolchain meant we didn't set `CGO_ENABLED=0` from bldr
anymore. Explicitly set it.

Signed-off-by: Noel Georgi <[email protected]>

Author: frezbo

network/tailscale/pkg.yaml

@@ -27,7 +27,7 @@ steps:
   - network: none
     build:
       - |
-        go build \
+        CGO_ENABLED=0 go build \
           -C tailscale \
           -o ../dist \
         	-ldflags "-X tailscale.com/version.shortStamp={{ .TAILSCALE_VERSION }} \