feat: add devcontainer spec

Author: mavi0

.devcontainer/Dockerfile

@@ -0,0 +1,28 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu
+
+# Install Elixir and Erlang from Ubuntu repositories
+RUN apt-get update && \
+    apt-get install -y erlang elixir && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Docker CLI
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+      docker.io && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Add user vscode to docker group
+RUN usermod -aG docker vscode
+
+# Install Rust for vscode user
+USER vscode
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
+ENV PATH="/home/vscode/.cargo/bin:${PATH}"
+
+# Install cross for cross compilation
+RUN cargo install cross
+
+# Switch back to root for any additional setup
+USER root

.devcontainer/devcontainer.json

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+{
+	"name": "Rust and Elixir Development",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "dev",
+	"workspaceFolder": "/workspace",
+	"customizations": {
+	  "vscode": {
+		"extensions": [
+		  "rust-lang.rust-analyzer",
+		  "jakebecker.elixir-ls",
+		  "ms-azuretools.vscode-docker"
+		]
+	  }
+	},
+	"remoteUser": "vscode",
+	"remoteEnv": {
+		"PATH": "${containerEnv:PATH}:/home/vscode/.cargo/bin"
+	},
+	"mounts": [
+        "source=${localEnv:HOME}/.ssh,target=/home/vscode/.ssh,type=bind,consistency=cached",
+        "source=${localEnv:HOME}/.ssh,target=${localEnv:HOME}/.ssh,type=bind,consistency=cached",
+        "source=${localEnv:HOME}/.gitconfig.d,target=/home/vscode/.gitconfig.d,type=bind,consistency=cached"
+    ],
+	"updateContentCommand": "[ -d ~/.cargo ] || curl https://sh.rustup.rs -sSf | sh -s -- -y"
+}

.devcontainer/docker-compose.yml

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+version: '3.8'
+
+services:
+  dev:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ..:/workspace:cached
+    command: sleep infinity
+    network_mode: service:docker
+
+  docker:
+    image: docker:dind
+    privileged: true
+    command: ["--host=tcp://0.0.0.0:2375"]
+    ports:
+      - "2375:2375"