Cleanup justfile and dockerfile

- Add a gitignore for output directory
- Make justfile use multi-lines for readability
- Remove COPY step from Dockerfile

.gitignore

@@ -0,0 +1 @@
+public

docker/Dockerfile

@@ -5,6 +5,4 @@ WORKDIR /opt/app
 RUN npm init -y
 RUN npm install @11ty/eleventy
 
-COPY . .
-
 CMD [ "npx", "@11ty/eleventy" ]

justfile

@@ -1,13 +1,35 @@
 set shell := ["bash", "-c"]
 
+HOST_PORT := "1280"
+
 # List just commands by default
 default:
     @just --list
 
-# Build image
+# Build the docker image
-build:
+docker-build:
-    docker buildx build -f ./docker/Dockerfile --tag 11ty:latest .
+    docker buildx build \
+        -f ./docker/Dockerfile \
+        --tag 11ty:latest \
+        .
 
 # Run development server
-dev: build
+dev:
-    docker run -it -p 1280:8080 11ty:latest npx @11ty/eleventy --serve
+    docker run \
+        -it \
+        -p {{HOST_PORT}}:8080 \
+        -v ./src:/opt/app/src \
+        -v ./public:/opt/app/public \
+        -v ./.eleventy.js:/opt/app/.eleventy.js \
+        11ty:latest \
+        npx @11ty/eleventy --serve
+
+# Build static site files
+build-site:
+    docker run \
+        -it \
+        -v ./src:/opt/app/src \
+        -v ./public:/opt/app/public \
+        -v ./.eleventy.js:/opt/app/.eleventy.js \
+        11ty:latest \
+        npx @11ty/eleventy