Added Alpine dev container for Go development

.devcontainer/Dockerfile

@@ -0,0 +1,10 @@
+FROM golang:1.13-alpine3.10
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=1000
+RUN adduser $USERNAME -s /bin/sh -D -u $USER_UID $USER_GID && \
+    mkdir -p /etc/sudoers.d && \
+    echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME && \
+    chmod 0440 /etc/sudoers.d/$USERNAME
+RUN apk add -q --update --progress --no-cache git sudo
+RUN go get -u -v golang.org/x/tools/cmd/gopls 2>&1

.devcontainer/devcontainer.json

@@ -0,0 +1,23 @@
+{
+    "name": "lazydocker dev",
+    "dockerFile": "Dockerfile",
+    "extensions": [
+        "ms-vscode.go",
+        "davidanson.vscode-markdownlint",
+        "shardulm94.trailing-spaces"
+    ],
+    "settings": {
+        "go.gopath": "/go",
+        "go.inferGopath": false,
+        "go.useLanguageServer": true
+    },
+    "postCreateCommand": "go mod download",
+    "runArgs": [
+        // Comment out the next line to run as root instead.
+        "-u",
+        "vscode",
+        "--cap-add=SYS_PTRACE",
+        "--security-opt",
+        "seccomp=unconfined"
+    ]
+}

.gitignore

@@ -1,4 +1,6 @@
 lazydocker*
 TODO.md
 Lazydocker.code-workspace
-.vscode
+.vscode/*
+!.vscode/extensions.json
+!.vscode/settings.json

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "ms-vscode.Go",
+        "ms-vscode-remote.remote-containers",
+        "ms-azuretools.vscode-docker",
+        "davidanson.vscode-markdownlint",
+        "shardulm94.trailing-spaces"
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "go.useLanguageServer": true,
+    "go.inferGopath": false,
+    "go.autocompleteUnimportedPackages": true
+}

CONTRIBUTING.md

@@ -53,6 +53,18 @@ go mod vendor
 
 Hopefully this will be much more streamlined in the future :)
 
+## Dev environment
+
+### Visual Studio Code
+
+If you use Visual Studio Code:
+1. Install the recommended extensions from the popup when you open this repository with it. It will essentially install
+    - the Go extension
+    - the Remote Containers extension
+1. You can then open the command palette (CTRL+Shift+P) and enter `Remote-Containers: Open Folder in container...`
+1. Select this directory
+1. Your dev environment will then be in a container so no need to setup any dependency on your host OS.
+
 ## Code of conduct
 
 Please note by participating in this project, you agree to abide by the [code of conduct].