Add containerized development for VS code

.devcontainer/Dockerfile

@@ -0,0 +1,44 @@
+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+
+FROM golang:1
+
+RUN go get -u -v \
+    github.com/mdempsky/gocode \
+    github.com/uudashr/gopkgs/cmd/gopkgs \
+    github.com/ramya-rao-a/go-outline \
+    github.com/acroca/go-symbols \
+    golang.org/x/tools/cmd/guru \
+    golang.org/x/tools/cmd/gorename \
+    github.com/rogpeppe/godef \
+    github.com/zmb3/gogetdoc \
+    github.com/sqs/goreturns \
+    golang.org/x/tools/cmd/goimports \
+    golang.org/x/lint/golint \
+    github.com/alecthomas/gometalinter \
+    honnef.co/go/tools/... \
+    github.com/golangci/golangci-lint/cmd/golangci-lint \
+    github.com/mgechev/revive \
+    github.com/derekparker/delve/cmd/dlv 2>&1 
+
+# gocode-gomod
+RUN go get -x -d github.com/stamblerre/gocode \
+    && go build -o gocode-gomod github.com/stamblerre/gocode \
+    && mv gocode-gomod $GOPATH/bin/
+
+# Install git, process tools, lsb-release (common in install instructions for CLIs)
+RUN apt-get update && apt-get -y install git procps lsb-release sqlite3
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN go get -u -v \ 
+    github.com/xo/xo \
+    github.com/aprice/embed/cmd/embed 2>&1
+
+# Set the default shell to bash instead of sh
+ENV SHELL /bin/bash

.devcontainer/devcontainer.json

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+// See https://aka.ms/vscode-remote/devcontainer.json for format details.
+{
+	"name": "Go",
+	"dockerFile": "Dockerfile",
+	"runArgs": [
+		"--cap-add=SYS_PTRACE",
+		"--security-opt", "seccomp=unconfined"
+	],
+
+	// Uncomment the next line if you want to publish any ports.
+	"appPort": [1587, 1025, 1143, 2003],
+
+	// Uncomment the next line to run commands after the container is created.
+	// "postCreateCommand": "go version",
+
+	"extensions": [
+		"ms-vscode.go"
+	],
+	"settings": {
+		"go.gopath": "/go"
+	}
+}

.gitignore

@@ -2,6 +2,7 @@
 henrymail
 henrymail.db
 henrymail.prop
+__debug_bin
 
 # IDE stuff
 .idea/

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "go",
+            "request": "launch",
+            "name": "Launch Program",
+            "program": "${workspaceFolder}"
+        }
+    ]
+}

.vscode/settings.json

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+{
+    "go.formatTool": "goimports"
+}

.vscode/tasks.json

@@ -0,0 +1,16 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "type": "shell",
+            "command": "go generate ./... && go build",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        }
+    ]
+}