Add the base containerized c toolchain environment

docker-compose.yml

@@ -0,0 +1,12 @@
+version: '3.8'
+
+services:
+  c_toolchain:
+    build:
+      context: ./
+      dockerfile: dockerfile.c_toolchain
+    container_name: c_toolchain
+    tty: true
+    stdin_open: true
+    volumes:
+      - ./dmzOS:/dmzOS