Add a Github Codespace Config based on gitpod dockerfile (#4185)

* Add a codespace config based on gitpod dockerfile

This will ensure contributors using Github Codespaces also have to
correct environemnt setup, with all packages installed.

* chore: rename Dockerfile

Co-authored-by: Nate Moore <nate@astro.build>

.devcontainer/devcontainer.json

@@ -0,0 +1,26 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.238.1/containers/docker-existing-dockerfile
+{
+	"name": "Contribute to Astro CodeSpaces",
+
+	// Sets the run context to one level up instead of the .devcontainer folder.
+	"context": "..",
+
+	// Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename.
+	"dockerFile": "../.Dockerfile",
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Uncomment the next line to run commands after the container is created - for example installing curl.
+	"postCreateCommand": "pnpm install"
+
+	// Uncomment when using a ptrace-based debugger like C++, Go, and Rust
+	// "runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Uncomment to use the Docker CLI from inside the container. See https://aka.ms/vscode-remote/samples/docker-from-docker.
+	// "mounts": [ "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind" ],
+
+	// Uncomment to connect as a non-root user if you've added one. See https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "vscode"
+}

.gitpod.yml

@@ -1,6 +1,6 @@
 ---
 image:
-  file: .gitpod.Dockerfile
+  file: .Dockerfile
 # Commands to start on workspace startup
 tasks:
   - init: |