x/build/env/linux-arm64-bullseye: add GCP builders

[cagedmantis]

Arm architecture machines are now available on Google Cloud Platform. We should deploy a set of builders for linux-arm64 and linux-arm.

Update: The arm32 builder work has been broken out into a separate issue. See #56693

@golang/release

[gopherbot]

Change https://go.dev/cl/447258 mentions this issue: cmd/buildlet/stage0: enable GCP linux-arm64 builders

[gopherbot]

Change https://go.dev/cl/447259 mentions this issue: dashboard, buildlet: add support for ARM64 COS images

[gopherbot]

Change https://go.dev/cl/447257 mentions this issue: env/linux-arm64-bullseye: add GCE ARM64 Debian builder

[gopherbot]

Change https://go.dev/cl/447260 mentions this issue: internal/coordinator/pool: add GCP t2a instance quotas

[gopherbot]

Change https://go.dev/cl/447738 mentions this issue: buildlet: use cloud init for ARM64 instances

[gopherbot]

Change https://go.dev/cl/447835 mentions this issue: dashboard: add linux-arm builder

[cagedmantis]

While testing a new configuration, the linux-arm builder defined as:

	addBuilder(BuildConfig{
		Name:     "linux-arm",
		HostType: "host-linux-arm64-bullseye",
		env: []string{
			"GOARCH=arm",
			"GOARM=6",
			"GOHOSTARCH=arm",
			"CGO_CFLAGS=-march=armv6",
			"CGO_LDFLAGS=-march=armv6",
		},
	})

Failed with the following error:

2022/11/04 16:09:01 Pushing 'go' dir...
2022/11/04 16:09:08 Running src/all.bash ...
:: Running /tmp/workdir/go/src/all.bash with args ["/tmp/workdir/go/src/all.bash"] and env ["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" "HOSTNAME=bb2db2bc93d8" "DEBIAN_FRONTEND=noninteractive" "HOME=/root" "USER=root" "GO_STAGE0_NET_DELAY=1s" "GO_STAGE0_DL_DELAY=200ms" "WORKDIR=/tmp/workdir" "GOROOT_BOOTSTRAP=/tmp/workdir/go1.4" "GO_BUILDER_NAME=linux-arm" "GOARCH=arm" "GOARM=6" "GOHOSTARCH=arm" "CGO_CFLAGS=-march=armv6" "CGO_LDFLAGS=-march=armv6" "TMPDIR=/tmp/w
orkdir/tmp" "GOCACHE=/tmp/workdir/gocache" "PWD=/tmp/workdir/go/src"] in dir /tmp/workdir/go/src

Building Go cmd/dist using /tmp/workdir/go1.4. (go1.17.13 linux/arm64)
Building Go toolchain1 using /tmp/workdir/go1.4.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
go tool dist: FAILED: /tmp/workdir/go/pkg/tool/linux_arm/go_bootstrap install cmd/asm cmd/cgo cmd/compile cmd/link: fork/exec /tmp/workdir/go/pkg/tool/linux_arm/go_bootstrap: exec format error
2022/11/04 16:09:31 remote failure running src/all.bash: exit status 2

A custom host configuration (such as we've done with AWS) may be necessary.

[cagedmantis]

The linux-arm64 builder is running in production.

[gopherbot]

Change https://go.dev/cl/449615 mentions this issue: all: replace linux-arm64-aws with linux-arm64

[gopherbot]

Change https://go.dev/cl/452858 mentions this issue: dashboard: add linux-arm64-longtest builder

[gopherbot]

Change https://go.dev/cl/453657 mentions this issue: cmd/xb: add ARM images to valid images lists

[gopherbot]

Change https://go.dev/cl/453658 mentions this issue: buildenv: remove zone without ARM machine types

[gopherbot]

Change https://go.dev/cl/456043 mentions this issue: dashboard: enable linux-arm64-longtest builder on 1.20+ release branches