added docs and container (podman + docker) setup

docs/docker/docker-revised.md

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+# Docker-Specific Guide
+
+## Docker vs Podman
+
+This project prioritizes **Podman** (OCI-compliant, rootless, daemonless). For Docker, convert commands:
+
+```bash
+# Podman → Docker
+podman build -t name .    →  docker build -t name .
+podman run -d name        →  docker run -d name
+```
+
+## Key Differences
+
+### SELinux
+
+**Podman**: Native support, use `:Z` or `:z` for volumes
+
+```bash
+podman run -v ./data:/data:Z name
+```
+
+**Docker**: Requires `selinux` mount option
+
+```bash
+docker run -v ./data:/data:Z name  # May not work
+docker run --security-opt label=type:container_t name
+```
+
+### Rootless
+
+**Podman**: Default rootless operation
+
+```bash
+podman run -d -p 8080:8080 name  # Works as user
+```
+
+**Docker**: Requires rootless daemon setup
+
+```bash
+dockerd-rootless-setuptool.sh install
+```
+
+### Systemd
+
+**Podman**: Native integration
+
+```bash
+podman generate systemd --new name
+```
+
+**Docker**: Use third-party solutions
+
+## Docker Files
+
+Use `Dockerfile` instead of `Containerfile`:
+
+```bash
+docker build -f assets/Dockerfile.alpine -t argparse-builder .
+```
+
+## Docker Compose
+
+Standard `docker-compose.yml` works, but note SELinux limitations:
+
+```yaml
+services:
+  app:
+    volumes:
+      - ./data:/data # No :Z support in Docker Compose
+```
+
+Workaround:
+
+```bash
+chcon -Rt container_file_t ./data  # Pre-label directory
+```
+
+## Migration to Podman
+
+1. Replace `docker` with `podman` in commands
+2. Add `:Z` to volume mounts for SELinux
+3. Use rootless by default
+4. Generate systemd units with Podman
+
+See `docs/container.md` for full Podman guide.