Remove Code and Configs for Swarm/podman support (#407)

- remove swarm / podman support
- remove docker-compose.yml, btrixcloud.swarm package, and podman/swarm scripts from scripts/ dir-
- remove python-on-whales
- add error if not running in k8s
- remove python-on-whales

backend/Dockerfile

@@ -1,7 +1,3 @@
-ARG PODMAN_VERSION=4
-
-FROM docker.io/mgoltzsche/podman:${PODMAN_VERSION}-remote as podmanremote
-
 FROM docker.io/library/python:3.10-slim
 
 WORKDIR /app
@@ -10,12 +6,8 @@ ADD requirements.txt /app
 
 RUN pip install -r requirements.txt
 
-RUN python-on-whales download-cli
-
 ADD btrixcloud/ /app/btrixcloud/
 
-COPY --from=podmanremote /usr/local/bin/podman-remote /usr/bin/podman
-
 CMD uvicorn btrixcloud.main:app_root --host 0.0.0.0 --access-log --log-level info
 
 EXPOSE 8000

backend/btrixcloud/main.py

@@ -26,6 +26,8 @@
 from .colls import init_collections_api
 from .crawls import init_crawls_api
 
+from .k8s.k8sman import K8SManager
+
 
 API_PREFIX = "/api"
 app_root = FastAPI(
@@ -67,16 +69,14 @@ def main():
     user_manager.set_archive_ops(archive_ops)
 
     # pylint: disable=import-outside-toplevel
-    if os.environ.get("KUBERNETES_SERVICE_HOST"):
-        from .k8s.k8sman import K8SManager
-
-        crawl_manager = K8SManager()
-    else:
-        # from .docker.dockerman import DockerManager
-        # crawl_manager = DockerManager(archive_ops)
-        from .swarm.swarmmanager import SwarmManager
-
-        crawl_manager = SwarmManager()
+    if not os.environ.get("KUBERNETES_SERVICE_HOST"):
+        print(
+            "Sorry, the Browsertrix Cloud Backend must be run inside a Kubernetes environment.\
+             Kubernetes not detected (KUBERNETES_SERVICE_HOST is not set), Exiting"
+        )
+        sys.exit(1)
+
+    crawl_manager = K8SManager()
 
     init_storages_api(archive_ops, crawl_manager, current_active_user)