Docker: Don't add the syntax file in the container.

Use host volumes to bind the plug-in directory as /var/php. This allows
us to change the syntax file without rebuilding the container.

Dockerfile

@@ -20,8 +20,9 @@ RUN apt-get -y install \
     php5-sqlite \
 ;
 
-ADD . /build
+ADD scripts/ /build
 
 WORKDIR /build
 
 ENTRYPOINT ["/usr/bin/php"]
+CMD ["update-vim-syntax.php"]

README.md

@@ -23,5 +23,6 @@ The project comes with a Dockerfile which can be used to rebuild the syntax file
 
 ```bash
 docker build -t stanangeloff/php.vim .
-docker run -i -t stanangeloff/php.vim scripts/update-vim-syntax.php | sed 's/\x0D$//' > syntax/php.vim
+docker run --rm -i -v "$PWD":/var/php -t stanangeloff/php.vim > /tmp/php.vim && cat /tmp/php.vim | sed 's/\x0D$//' > syntax/php.vim
+docker rmi stanangeloff/php.vim
 ```

scripts/update-vim-syntax.php

@@ -156,7 +156,7 @@
 
 # Read the existing syntax file with block markers in it.
 #
-$template = file_get_contents(__DIR__ . '/../syntax/php.vim');
+$template = file_get_contents('/var/php/syntax/php.vim');
 
 # Clean up any previously defined blocks.
 $template = preg_replace(