[tmpnet] Rename tmpnetctl package from cmd to tmpnetctl

This enables downstream repos to `go install` `tmptnetctl` rather than `cmd`.

Author: maru-ava

scripts/build_tmpnetctl.sh

@@ -12,4 +12,4 @@ echo "Building tmpnetctl..."
 go build -ldflags\
    "-X github.com/ava-labs/avalanchego/version.GitCommit=$git_commit $static_ld_flags"\
    -o "$AVALANCHE_PATH/build/tmpnetctl"\
-   "$AVALANCHE_PATH/tests/fixture/tmpnet/cmd/"*.go
+   "$AVALANCHE_PATH/tests/fixture/tmpnet/tmpnetctl/"*.go

tests/fixture/tmpnet/README.md

@@ -444,16 +444,27 @@ flake that inherits from the avalanchego flake:
 }
 ```
 
-The action also requires being able to invoke tmpnetctl via `go
-run`. Use of a `tools.go` file that imports tmpnetctl is suggested to
-enable this:
+The action expects to be able to run bin/tmpnetctl from the root of
+the repository. A suggested version of this script:
 
-```golang
-package tools
+```bash
+#!/usr/bin/env bash
 
-import (
-	_ "github.com/ava-labs/avalanchego/tests/fixture/tmpnet/cmd" // tmpnetctl
-)
+set -euo pipefail
+
+# Ensure the go command is run from the root of the repository
+REPO_ROOT=$(cd "$( dirname "${BASH_SOURCE[0]}" )"; cd .. && pwd )
+cd "${REPO_ROOT}"
+
+# Set AVALANCHE_VERSION
+source ./scripts/versions.sh
+
+# Install if not already available
+if command -v tmpnetctl &2> /dev/null; then
+  # An explicit version is required since a main package can't be included as a dependency of the go module.
+  go install github.com/ava-labs/avalanchego/tests/fixture/tmpnet/tmpnetctl@${AVALANCHE_VERSION}
+fi
+tmpnetctl "${@}"
 ```
 
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