tbw: add go-cacher

Updates tailscale/go#77
Updates tailscale/tailcsale#9841

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

Dockerfile.tbw

@@ -2,14 +2,16 @@
 FROM golang:1.21 AS build
 
 WORKDIR /go/src/tbw
+RUN mkdir -p /out
 
 COPY go.mod go.sum .
 RUN go mod download
 ENV CGO_ENABLED=0
+ENV GOBIN=/out
+RUN go install github.com/bradfitz/go-tool-cache/cmd/go-cacher
 
 COPY . .
-RUN mkdir -p /out
-RUN go build -o /out/tbw ./tbw
+RUN go install ./tbw
 
 # Deploy
 FROM debian:bookworm
@@ -18,4 +20,6 @@ RUN apt-get update && apt-get install -y \
     ca-certificates git curl jq strace
 
 COPY --from=build /out/tbw /tbw
+COPY --from=build /out/go-cacher /usr/local/bin/go-cacher
+
 CMD ["/tbw"]

go.mod

@@ -4,7 +4,10 @@ go 1.21
 
 toolchain go1.21.3
 
-require tailscale.com v1.50.1
+require (
+	github.com/bradfitz/go-tool-cache v0.0.0-20230425225207-ef6c7b1b26e9
+	tailscale.com v1.50.1
+)
 
 require (
 	filippo.io/edwards25519 v1.0.0 // indirect

go.sum

@@ -40,6 +40,8 @@ github.com/aws/smithy-go v1.13.5 h1:hgz0X/DX0dGqTYpGALqXJoRKRj5oQ7150i5FdTePzO8=
 github.com/aws/smithy-go v1.13.5/go.mod h1:Tg+OJXh4MB2R/uN61Ko2f6hTZwB/ZYGOtib8J3gBHzA=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bradfitz/go-tool-cache v0.0.0-20230425225207-ef6c7b1b26e9 h1:A7mRm2K7DIAaL6pC8xk3vziokHYWCgLxkIq5+hxvxb0=
+github.com/bradfitz/go-tool-cache v0.0.0-20230425225207-ef6c7b1b26e9/go.mod h1:tjGzW4FGE+ljtBMRJvTjP+4hTHVpY2MRC/+bTjGLMBs=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cilium/ebpf v0.10.0 h1:nk5HPMeoBXtOzbkZBWym+ZWq1GIiHUsBFXxwewXAHLQ=

tbw/cmd_deps.go

@@ -0,0 +1,7 @@
+//go:build deps_just_for_go_mod_tidy
+
+package main
+
+import (
+	_ "github.com/bradfitz/go-tool-cache/cmd/go-cacher"
+)