feat: add devcontainer

.devcontainer/Dockerfile

@@ -0,0 +1,8 @@
+FROM mcr.microsoft.com/devcontainers/base:noble
+
+RUN curl --proto '=https' --tlsv1.2 -fsSL https://get.opentofu.org/install-opentofu.sh | /bin/bash -s -- --install-method deb
+
+RUN wget -O - https://apt.releases.hashicorp.com/gpg | gpg --dearmor -o /usr/share/keyrings/hashicorp-archive-keyring.gpg && \
+    echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(lsb_release -cs) main" > /etc/apt/sources.list.d/hashicorp.list && \
+    apt update && \
+    apt install packer

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "https://raw.githubusercontent.com/devcontainers/spec/refs/heads/main/schemas/devContainer.schema.json",
+  "name": "Cluster",
+  "build": {
+    "dockerfile": "Dockerfile"
+  }
+
+  // Features to add to the dev container. More info: https://containers.dev/features.
+  // "features": {},
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // "postCreateCommand": "uname -a",
+
+  // Configure tool-specific properties.
+  // "customizations": {},
+
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  // "remoteUser": "root"
+}