chore: add initial vscode devcontainer files (#6736)

.determined.code-workspace

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+{
+    "folders": [
+        {
+            "path": "."
+        }
+    ]
+}

.devcontainer/README.md

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+### Steps for using a devcontainer (without Kubernetes)
+
+0. Launch a cluster with the `det deploy` command.
+1. Ensure that VSCode dev extensions are installed.
+2. SSH to server instance and setup VSCode with remote SSH server.
+3. Resize disk space on remote server if needed.
+4. Setup github credentials and clone repository.
+5. Stop the deployed server instance.
+6. Open workspace file with VSCode connected to remote SSH server.
+7. Use VSCode to build and launch devcontainer.
+8. After remote server launches localhost:8080 should be available.

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/go
+{
+	"name": "determined-backend-dev-go",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/go:0-1.20",
+	"features": {
+		"ghcr.io/guiyomh/features/golangci-lint:0": {},
+		"ghcr.io/devcontainers/features/python:1": {},
+		"ghcr.io/devcontainers/features/node:1": {
+			"nodeGypDependencies": true,
+			"version": "19.7.0"
+		}
+	},
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [ 8080 ],
+	"appPort": [ 8080 ],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "go version",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	"mounts": [
+		{
+			"type": "bind",
+			"source": "/usr/local/determined/etc",
+			"target": "/etc/determined"
+		},
+		{
+			"type": "volume",
+			"source": "dev-home",
+			"target": "/home"
+		},
+		{
+			"type": "volume",
+			"source": "dev-go",
+			"target": "/go"
+		},
+		{
+			"type": "volume",
+			"source": "dev-usr",
+			"target": "/usr"
+		},
+		{
+			"type": "volume",
+			"source": "dev-var",
+			"target": "/var"
+		}
+	],
+
+	"runArgs": [
+		"--network=host"
+	],
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root",
+	"privileged": true,
+
+	"postStartCommand": ".devcontainer/start.sh"
+}

.devcontainer/server.sh

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+#!/usr/bin/env bash
+set -xeuo pipefail
+
+VERSION=$(cat VERSION)
+GO_LDFLAGS="-X github.com/determined-ai/determined/master/version.Version=${VERSION}"
+
+nodemon --watch './**/*' -e go --signal SIGTERM --exec \
+    go run -ldflags "${GO_LDFLAGS}" \
+    ./master/cmd/determined-master -- --log-level debug 2>&1

.devcontainer/setup.sh

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+#!/usr/bin/env bash
+set -xeuo pipefail
+
+if [ -z "$(command -v helm)" ]; then
+    curl -L https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
+fi
+if [ -z "$(command -v protoc)" ]; then
+    curl --retry-connrefused --retry 10 -o /tmp/protoc.zip -L https://github.com/protocolbuffers/protobuf/releases/download/v3.20.3/protoc-3.20.3-linux-x86_64.zip
+    sudo unzip -o /tmp/protoc.zip -d /usr/local
+fi
+if [ -z "$(command -v nodemon)" ]; then
+    npm i -g nodemon
+fi
+
+make get-deps
+
+make -C proto build
+make -C harness build
+make -C webui build
+make -C docs build
+make -C agent build
+
+make -C tools prep-root
+sudo mkdir -p /usr/share/determined
+sudo ln -sfT ${PWD}/tools/build /usr/share/determined/master
+
+sudo chmod a+w /var/cache

.devcontainer/start.sh

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+#!/usr/bin/env bash
+set -xeuo pipefail
+
+STAMP=${HOME}/.determined-setup.stamp
+if [ ! -f ${STAMP} ]; then
+    .devcontainer/setup.sh
+    touch ${STAMP}
+fi
+
+LOG=${HOME}/determined-server.log
+touch ${LOG}
+nohup .devcontainer/server.sh >>${LOG} &
+tail -f ${LOG}