feat: install dev env tools correctly

.devcontainer/bin/setup-dev-env

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+install-go-devtools() {
+  go install github.com/go-delve/delve/cmd/dlv@latest
+  go install honnef.co/go/tools/cmd/staticcheck@latest
+}
+
+install-go-mods() {
+  local plugin_root="/root/go/src/github.com/dokku/dokku/plugins"
+
+  export GO111MODULE=off
+  echo "-----> Fetching onsi/gomega dependency for tests"
+  go get github.com/onsi/gomega || true
+
+  echo "-----> Fetching spf13/pflag dependency for subcommands"
+  go get github.com/spf13/pflag || true
+  pushd "$plugin_root" >/dev/null || true
+  find "$plugin_root/" -mindepth 1 -maxdepth 1 -type d -printf '%f\n' | while read -r plugin; do
+    pushd "$plugin_root/$plugin" >/dev/null || true
+    if [[ -f "go.mod" ]]; then
+      echo "-----> Fetching dependencies for $plugin plugin"
+      go get || true
+    fi
+    popd >/dev/null || true
+  done
+  popd >/dev/null || true
+}
+
+setup-ci() {
+  local dokku_root="/root/go/src/github.com/dokku/dokku"
+  pushd "$plugin_root" >/dev/null || true
+  make ci-dependencies setup-deploy-tests
+  popd >/dev/null || true
+}
+
+main () {
+  install-go-mods
+  install-go-devtools
+  setup-ci
+}
+
+main "$@"