podman test: go multistage build, rootless in bookworm

gistfile0.txt

pabs@worm:~/golang-container-test> l
Dockerfile  go.mod  hi.go
pabs@worm:~/golang-container-test> cat go.mod
module hi

go 1.20
pabs@worm:~/golang-container-test> cat hi.go
package main

import (
  "log"
  "net/http"
  "os"
)

func main() {
  // get bind address
  addr := ":4567"
  if len(os.Args) > 1 {
    addr = os.Args[1]
  }

  // bind handler to /
  http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("hi!"))
  })

  // serve
  log.Fatal(http.ListenAndServe(addr, nil))
}
pabs@worm:~/golang-container-test> cat Dockerfile 
FROM docker.io/golang:1.20-alpine AS build
COPY . /src
WORKDIR /src
RUN ["go", "build", "-trimpath", "-ldflags=-s -w"]

FROM scratch
COPY --from=build /src/hi /hi
CMD ["/hi", ":4567"]
pabs@worm:~/golang-container-test> podman build -t go-hi .
[1/2] STEP 1/4: FROM docker.io/golang:1.20-alpine AS build
[1/2] STEP 2/4: COPY . /src
--> 9b83f0af9d9
[1/2] STEP 3/4: WORKDIR /src
--> 49f6a921ef8
[1/2] STEP 4/4: RUN ["go", "build", "-trimpath", "-ldflags=-s -w"]
--> f3fea1b1b2a
[2/2] STEP 1/3: FROM scratch
[2/2] STEP 2/3: COPY --from=build /src/hi /hi
--> Using cache a17890bd631213ff9185f270e44f5dffcdfb54edf0dc294afd1de6a7f57ce570
--> a17890bd631
[2/2] STEP 3/3: CMD ["/hi", ":4567"]
--> Using cache 8cccd4df594c57e609d12b95c8aae314efbd1da247d168c4c459ddeb5b469131
[2/2] COMMIT go-hi
--> 8cccd4df594
Successfully tagged localhost/go-hi:latest
8cccd4df594c57e609d12b95c8aae314efbd1da247d168c4c459ddeb5b469131
pabs@worm:~/golang-container-test> podman run --rm -d -p 4568:4567 go-hi
57729c23352307b46e2865b70d61d2d1d72bc36837ab250c1270ec5aeebce1b5

# test from a different machine
pabs@flex:~> curl http://192.168.122.156:4568/; echo
hi!
pabs@flex:~>

# check image sizes
pabs@worm:~/golang-container-test> podman images 'localhost/*'
REPOSITORY        TAG         IMAGE ID      CREATED            SIZE
localhost/go-hi   latest      8cccd4df594c  8 minutes ago      4.55 MB
localhost/hi      latest      a88bf49da5c1  About an hour ago  921 MB
localhost/foobar  latest      586d246d3e92  4 hours ago        14.2 MB
pabs@worm:~/golang-container-test>