feat: ensure related go source and vscode plugins are installed in devcontainer

.devcontainer/Dockerfile

@@ -7,6 +7,12 @@ RUN apt-get install --no-install-recommends -y build-essential file nano && \
   apt-get autoremove --yes && \
   rm -rf /var/lib/apt/lists/*
 
+RUN wget https://dl.google.com/go/go1.16.10.linux-amd64.tar.gz && \
+  tar -xvf go1.16.10.linux-amd64.tar.gz && \
+  mv go /usr/local
+
+RUN GOROOT=/usr/local/go /usr/local/go/bin/go install golang.org/x/tools/gopls@latest 2>&1
+
 ADD https://raw.githubusercontent.com/dokku/dokku/master/tests/dhparam.pem /mnt/dokku/etc/nginx/dhparam.pem
 
 COPY .devcontainer/bin/ /usr/local/bin/
@@ -15,5 +21,6 @@ RUN make ci-dependencies
 
 COPY . .
 
-ENV DOKKU_HOSTNAME=dokku.me
+ENV DOKKU_HOSTNAME=dokku.me GOROOT=/usr/local/go PATH=/usr/local/go/bin:$PATH PLUGIN_MAKE_TARGET=build
+
 LABEL org.label-schema.schema-version=1.0 org.label-schema.vendor=dokku com.dokku.devcontainer=true

.devcontainer/bin/copy-plugin

@@ -3,7 +3,7 @@
 main() {
   declare PLUGIN_NAME="$1"
 
-  make go-build-plugin copyplugin PLUGIN_NAME=$PLUGIN_NAME
+  make go-build-plugin copyplugin PLUGIN_NAME=$PLUGIN_NAME PLUGIN_MAKE_TARGET=build
 }
 
 main "$@"

.devcontainer/bin/go-mod-downloadall

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -x
+
+main() {
+  find plugins/ -mindepth 1 -maxdepth 1 -type d -printf '%f\n' | while read plugin; do
+    if [[ ! -f "plugins/$plugin/go.mod" ]]; then
+      continue
+    fi
+
+    pushd "plugins/$plugin" >/dev/null || return 1
+    echo "====> Cloning all modules $plugin"
+    go list -m -f '{{define "M"}}git clone https://{{.Path}}.git /root/go/src/{{.Path}} || true && echo {{.Version}}{{end}}{{if not .Main}}{{if not .Replace}}{{template "M" .}}{{end}}{{end}}' all >tmp-file
+    bash tmp-file
+    rm tmp-file
+
+    go list -m -f '{{define "M"}}git clone https://{{.Path}}.git /usr/local/go/src/{{.Path}} || true && echo {{.Version}}{{end}}{{if not .Main}}{{if not .Replace}}{{template "M" .}}{{end}}{{end}}' all >tmp-file
+    bash tmp-file
+    rm tmp-file
+    popd >/dev/null || return 1
+  done
+}
+
+main "$@"

.devcontainer/devcontainer.json

@@ -7,12 +7,19 @@
     "DOKKU_HOST_ROOT": "${localWorkspaceFolder}/tmp/data/home/dokku",
     "GO_ROOT_MOUNT": "${localWorkspaceFolder}:/go/src/github.com/dokku/dokku"
   },
+  "extensions": [
+    "golang.go",
+    "mads-hartmann.bash-ide-vscode",
+    "ms-vscode.makefile-tools"
+  ],
   "initializeCommand": ["mkdir", "-p", "tmp/data"],
   "mounts": [
     "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind",
     "source=${localWorkspaceFolder}/tmp/data/,target=/mnt/dokku/,type=bind"
   ],
   "overrideCommand": false,
-  "postCreateCommand": ["make", "setup-deploy-tests"],
-  "runArgs": ["--init"]
+  "postCreateCommand": "make setup-deploy-tests && go-mod-downloadall",
+  "runArgs": ["--init"],
+  "workspaceFolder": "/root/go/src/github.com/dokku/dokku",
+  "workspaceMount": "type=bind,source=${localWorkspaceFolder},target=/root/go/src/github.com/dokku/dokku,consistency=cached"
 }

.gitignore

@@ -3,6 +3,7 @@
 .DS_Store
 .ruby-version
 .idea/
+.vscode/
 .vagrant
 build/
 data/