Add Docker files for testing

.docker/Dockerfile

@@ -0,0 +1,15 @@
+FROM homebrew/brew:latest AS xion
+
+  ENV LEDGER_ENABLED=false
+  ENV LINK_STATICALLY=false
+
+  RUN set -eux \
+    && brew update \
+    && brew install [email protected]
+
+  RUN set -eux \
+    && brew tap burnt-labs/xion \
+    && brew install xiond \
+    && xiond version --long
+
+  CMD ["xiond", "version", "--long"]

README.md

@@ -1,14 +1,19 @@
 # homebrew-xion
 
-## How do I install these formulae?
+Homebrew formula for the Xion Daemon
 
-`brew install burnt-labs/xion/<formula>`
+## Install
 
-Or `brew tap burnt-labs/xion` and then `brew install <formula>`.
+```bash
+$ brew tap burnt-labs/xion
+$ brew install xiond
+```
 
-## Documentation
+## Testing
 
-`brew help`, `man brew` or check [Homebrew's documentation](https://docs.brew.sh).
+```bash
+$ docker compose up ubuntu
+```
 
 ## Linting
 

docker-compose.yaml

@@ -0,0 +1,8 @@
+services:
+
+  ubuntu:
+    image: burnt-labs/brew
+    build:
+      context: .docker
+      dockerfile: Dockerfile
+    platform: linux/amd64