Add CI to match other Rust projcets

.devcontainer/Dockerfile

@@ -1,7 +0,0 @@
-FROM ghcr.io/crystal-linux/crystal:latest
-
-RUN  pacman -S --needed --noconfirm cargo openssl git binutils fakeroot pacman-contrib
-RUN  useradd -m -G wheel vscode
-RUN  bash -c "echo \"vscode ALL=(ALL) NOPASSWD: ALL\" >> /etc/sudoers"
-
-ENV  USER=vscode

.devcontainer/devcontainer.json

@@ -1,25 +0,0 @@
-{
-  "name": "Malachite",
-
-  "build": {
-    "dockerfile": "Dockerfile",
-  },
-
-  "containerEnv": {
-    "PROJECT_DIR": "${containerWorkspaceFolder}"
-  },
-
-  "settings": {
-    "terminal.integrated.shell.linux": "/bin/bash"
-  },
-
-  "extensions": [
-    "vadimcn.vscode-lldb",
-    "mutantdino.resourcemonitor",
-    "matklad.rust-analyzer",
-    "tamasfe.even-better-toml",
-    "serayuzgur.crates"
-  ],
-
-  "remoteUser": "vscode",
-}