Dockerfile uses Go 1.21.6 but go.mod requires Go >= 1.23.0

[sudiplun]

There is a mismatch between the Go version declared in go.mod and the one used in the Dockerfile.

• go.mod requires:
  go 1.23
• But Dockerfile uses:
  FROM golang:1.21.6

This results in the following error during Docker build:
go: go.mod requires go >= 1.23.0 (running go 1.21.6; GOTOOLCHAIN=local)
failed to solve: process "/bin/sh -c go mod download" did not complete successfully: exit code: 1

[JMcrafter26]

In your Dockerfile, replace this

# build go
FROM golang:1.21.6

with this:

# build go
FROM golang:1.23