make the token and control urls configurable #5

Job	Run time
cross (linux, arm64)	1m 17s
privileged	55s
cross (linux, 386)	1m 27s
race-build	4m 24s
cross (linux, loong64)	1m 17s
race-root-integration (1/4)	1m 23s
cross (linux, arm, 5)	3m 45s
test (amd64, -coverprofile=/tmp/coverage.out)	3m 42s
vm	0s
race-root-integration (2/4)	1m 18s
cross (linux, arm, 7)	5m 22s
test (amd64, -race, 1/3)	3m 12s
race-root-integration (3/4)	1m 16s
cross (darwin, amd64)	1m 15s
test (amd64, -race, 2/3)	3m 9s
race-root-integration (4/4)	1m 19s
cross (darwin, arm64)	1m 29s
windows	3m 14s
test (amd64, -race, 3/3)	3m 34s
test (386)	2m 13s
android	54s
cross (windows, amd64)	3m 30s
cross (windows, arm64)	3m 27s
crossmin (plan9, amd64)	53s
cross (freebsd, amd64)	1m 27s
crossmin (aix, ppc64)	57s
depaware	30s
cross (openbsd, amd64)	3m 44s
fuzz	7m 13s
go_generate	1m 7s
go_mod_tidy	27s
ios	45s
tailscale_go	31s
wasm	6m 25s
licenses	7s
staticcheck (linux, amd64)	3m 36s
staticcheck (windows, amd64)	3m 26s
staticcheck (darwin, amd64)	3m 32s
staticcheck (windows, 386)	3m 23s
notify_slack	3s
check_mergeability	4s
	1h 31m 32s

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