Add containerized xstow static build

README.md

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+# xstow-builder
+
+Reproducible static build of `xstow` for systems where `stow` or `xstow` isn't
+already available. Unlike `stow`, which requires Perl and it's dependencies,
+this statically-linked `xstow` binary is self-contained and can be dropped into
+`~/.local/bin` without any installation requirements.
+
+## Build
+
+Running the `docker-compose.yml` will spin up a Rocky Linux container, compile
+`xstow` with static linking, and output the binary to `./build/xstow` in your
+local repository.
+
+Podman:
+
+    podman-compose up --build
+
+Docker:
+
+    docker compose up --build
+
+Binary output: `./build/xstow`
+
+## License
+
+This project is released under the 0BSD license, which allows for unrestricted
+use, modification, and distribution.