chore(gitpod): migrate Classic Gitpod config to devcontainers

Spoiler: Gitpod tasks are now under the automations.yaml file, along
side support for services in Gitpod Flex. :)

Signed-off-by: Andrei Jiroh Halili <ajhalili2006@andreijiroh.dev>

.devcontainer/devcontainer.json

@@ -0,0 +1,31 @@
+// The Dev Container format allows you to configure your environment. At the heart of it
+// is a Docker image or Dockerfile which controls the tools available in your environment.
+//
+// See https://aka.ms/devcontainer.json for more information.
+{
+	"name": "Gitpod",
+	// Use "image": "mcr.microsoft.com/vscode/devcontainers/base:ubuntu",
+	// instead of the build to use a pre-built image.
+	"build": {
+        "context": ".",
+        "dockerfile": "Dockerfile"
+    },
+	// Features add additional features to your environment. See https://containers.dev/features
+	// Beware: features are not supported on all platforms and may have unintended side-effects.
+	"features": {
+        "ghcr.io/devcontainers/features/docker-in-docker:2": {}
+    },
+	"remoteUser": "gitpod",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"foam.foam-vscode",
+				"DavidAnson.vscode-markdownlint",
+				"timonwong.shellcheck",
+				"ms-azuretools.vscode-docker",
+				"vivaxy.vscode-conventional-commits",
+				"akosyakov.gitpod-monitor"
+			]
+		}
+	}
+}