go: Adopt .tool-versions and standardise setup script

go/.gitignore

@@ -0,0 +1,2 @@
+# Go build output
+/go

go/.tool-versions

@@ -0,0 +1 @@
+go 1

go/README.md

@@ -1,14 +1,29 @@
-# GO
+# Go
 
 Skeleton project for Go.
 
+## Prerequisites
+
+The toolchain this project needs is declared in [`.tool-versions`](./.tool-versions):
+
+```
+go 1
+```
+
+Install those however you prefer, as long as they end up on your `PATH`. The quickest route is
+[mise](https://mise.jdx.dev/), which reads the file for you:
+
+```sh
+mise install
+```
+
 ## Usage
-- `./script/setup` to install dependencies
+- `./script/setup` to fetch dependencies
 - `./script/test` to run the tests
-- `./script/start` to run the code
+- `./script/start` to run the app
 
 ## Structure
-- Code located in [`pairing.go`](./src/pairing.go) and [`main.go`](main.go)
-- Tests located in [`pairing_test.go`](./src/pairing_test.go)
+- Code located in [`main.go`](./main.go) and [`src/pairing.go`](./src/pairing.go)
+- Tests located in [`src/pairing_test.go`](./src/pairing_test.go)
 
-However, you're free to organise your code as you like. 
+However, you're free to organise your code as you like.

go/script/setup

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
-set -e
+set -euo pipefail
 
-brew install go
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
+
+go mod download

go/script/start

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
-set -e
+set -euo pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
 
 go run main.go