feat: Update Docker image configuration for execution environment

- Changed the Docker image tag in `docker-compose.ghcr.yml` from `latest` to `dev` for development purposes.
- Enhanced the `Settings` class to include a new field for `docker_image_tag`, allowing dynamic specification of image tags.
- Modified the `get_image_for_language` function in `languages.py` to accept a tag parameter, improving flexibility in image retrieval.

Author: usnavy13

docker-compose.ghcr.yml

@@ -1,7 +1,7 @@
 services:
   # Code Interpreter API
   api:
-    image: ghcr.io/usnavy13/librecodeinterpreter:latest
+    image: ghcr.io/usnavy13/librecodeinterpreter:dev
     container_name: code-interpreter-api
     user: "1000:988" # Run as user with docker group access
     cap_add:
@@ -16,6 +16,7 @@ services:
       - API_HOST=0.0.0.0
       - API_PORT=8000
       - DOCKER_IMAGE_REGISTRY=ghcr.io/usnavy13/librecodeinterpreter
+      - DOCKER_IMAGE_TAG=${DOCKER_IMAGE_TAG:-latest}
 
       # Service discovery (container names)
       - REDIS_HOST=redis

src/config/__init__.py

@@ -115,6 +115,10 @@ class Settings(BaseSettings):
         default="code-interpreter",
         description="Registry/namespace prefix for execution environment images",
     )
+    docker_image_tag: str = Field(
+        default="latest",
+        description="Tag for execution environment images (e.g. 'latest', 'dev')",
+    )
     docker_timeout: int = Field(default=60, ge=10)
     docker_network_mode: str = Field(default="none")
     docker_security_opt: List[str] = Field(
@@ -599,7 +603,7 @@ def get_image_for_language(self, code: str) -> str:
 
         # Fallback to languages.py logic if not in settings
         from .languages import get_image_for_language as get_img
-        return get_img(code, registry=self.docker_image_registry)
+        return get_img(code, registry=self.docker_image_registry, tag=self.docker_image_tag)
 
     def get_execution_timeout(self, language: str) -> int:
         """Get execution timeout for a specific language."""

src/config/languages.py

@@ -183,11 +183,15 @@ def is_supported_language(code: str) -> bool:
 
 
 # Convenience lookups for backward compatibility during transition
-def get_image_for_language(code: str, registry: Optional[str] = None) -> str:
+def get_image_for_language(code: str, registry: Optional[str] = None, tag: str = "latest") -> str:
     """Get Docker image for a language."""
     lang = get_language(code)
     if lang:
-        return f"{registry}/{lang.image}" if registry else lang.image
+        # Extract base image name without the default :latest tag
+        base_image = lang.image.rsplit(":", 1)[0]
+        if registry:
+            return f"{registry}/{base_image}:{tag}"
+        return f"{base_image}:{tag}"
     raise ValueError(f"Unsupported language: {code}")