Add a devcontainer config (#807)

Summary:
Add a devcontainer config

My laptop is full of weird versions of weird tools. Sapling requires specific versions of specific tools. It's nice to be able to open the sapling folder in vscode and get a prompt for "would you like to do your development inside a container with all the correct tools pre-installed?" :) This also allows people on github to click a button to open in github's web-based container-IDE and start developing without installing anything at all, though I don't know if we'd expect anybody to do that

For starters I'm using the CI build image without changes to try and keep the maintenance burden as small as possible, though it would be possible to use a separate layer within the Dockerfile (eg if we wanted to install extra tools that are useful for dev but not needed for building), or have a totally separate Dockerfile

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[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/sapling/pull/807).
* __->__ https://github.com/facebook/sapling/issues/807
* https://github.com/facebook/sapling/issues/806
* https://github.com/facebook/sapling/issues/804

Pull Request resolved: https://github.com/facebook/sapling/pull/807

Differential Revision: D52575911

Pulled By: quark-zju

fbshipit-source-id: b24e1a21493f18a06355c984a72936cd11fef2ea

.devcontainer/README.md

@@ -0,0 +1,2 @@
+For format details, see https://aka.ms/devcontainer.json
+For config options, see the README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-dockerfile

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+{
+	"name": "Sapling",
+	"build": {
+		"context": "..",
+		"dockerfile": "../.github/workflows/sapling-cli-ubuntu-22.04.Dockerfile"
+	},
+	"updateContentCommand": "ln -sf /workspaces/sapling/eden/scm/sl /usr/local/bin/sl",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-azuretools.vscode-docker",
+				"ms-python.python",
+				"rust-lang.rust-analyzer"
+			],
+			"settings": {
+				"rust-analyzer.linkedProjects": [
+					"/workspaces/sapling/eden/scm/Cargo.toml"
+				]
+			}
+		}
+	}
+}

.github/workflows/sapling-cli-ubuntu-20.04.Dockerfile

@@ -18,7 +18,8 @@ RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesourc
 
 # Now we can install the bulk of the packages:
 RUN apt-get -y update
-RUN apt-get -y install nodejs pkg-config libssl-dev cython3 make g++ dpkg-dev python3.8 python3.8-dev python3.8-distutils
+RUN apt-get -y install nodejs pkg-config libssl-dev cython3 make g++ dpkg-dev gettext locales python3.8 python3.8-dev python3.8-distutils
+RUN locale-gen en_US.UTF-8
 
 # Unfortunately, we cannot `apt install cargo` because at the time of this
 # writing, it installs a version of cargo that is too old (1.59). Specifically,

.github/workflows/sapling-cli-ubuntu-22.04.Dockerfile

@@ -18,7 +18,8 @@ RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesourc
 
 # Now we can install the bulk of the packages:
 RUN apt-get -y update
-RUN apt-get -y install nodejs pkg-config libssl-dev cython3 make g++ dpkg-dev python3.10 python3.10-dev python3.10-distutils
+RUN apt-get -y install nodejs pkg-config libssl-dev cython3 make g++ dpkg-dev gettext locales python3.10 python3.10-dev python3.10-distutils
+RUN locale-gen en_US.UTF-8
 
 # Unfortunately, we cannot `apt install cargo` because at the time of this
 # writing, it installs a version of cargo that is too old (1.59). Specifically,

ci/gen_workflows.py

@@ -37,6 +37,8 @@ UBUNTU_DEPS = [
     "g++",
     # This is needed for dpkg-name.
     "dpkg-dev",
+    "gettext",
+    "locales",
 ]
 
 MACOS_RELEASES = {
@@ -116,6 +118,7 @@ RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesourc
 # Now we can install the bulk of the packages:
 RUN apt-get -y update
 RUN apt-get -y install {' '.join(full_deps)}
+RUN locale-gen en_US.UTF-8
 
 # Unfortunately, we cannot `apt install cargo` because at the time of this
 # writing, it installs a version of cargo that is too old (1.59). Specifically,