adds devcontainer with docker

.devcontainer/Dockerfile

@@ -2,8 +2,17 @@ FROM python:3.11-slim
 
 # Dev tools — not needed in production, but essential for development
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    git \
+    ca-certificates \
     curl \
+    gnupg \
+    && install -m 0755 -d /etc/apt/keyrings \
+    && curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.asc \
+    && chmod a+r /etc/apt/keyrings/docker.asc \
+    && echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+    tee /etc/apt/sources.list.d/docker.list > /dev/null \
+    && apt-get update && apt-get install -y --no-install-recommends \
+    docker-ce-cli \
+    git \
     ffmpeg \
     && rm -rf /var/lib/apt/lists/*
 

.devcontainer/devcontainer.json

@@ -1,7 +1,8 @@
 {
   "name": "Guardian Newscast Pipeline",
   "build": {
-    "dockerfile": "Dockerfile"
+    "dockerfile": "Dockerfile",
+    "context": ".."
   },
   "forwardPorts": [8080],
   "portsAttributes": {