Dockerfile would not start up with weird line endings, add Docker instructions

Dockerfile

@@ -62,7 +62,8 @@ RUN cd /root/gwc-release && bundle install
 COPY setup_git.sh /usr/local/bin/setup_git.sh
 
 # Make the script executable
-RUN chmod +x /usr/local/bin/setup_git.sh
+RUN dos2unix /usr/local/bin/setup_git.sh && \
+	chmod +x /usr/local/bin/setup_git.sh
 
 # Set the script as the entrypoint
 ENTRYPOINT ["/usr/local/bin/setup_git.sh"]

README.md

@@ -1,5 +1,37 @@
+# Andrea's docker image
+
+The ruby script used below for the automated release of GeoWebCache, relied on an old setup that was difficult to reproduce.  This resulted in a small number of volunteers being able to release GWC, until Andrea created this docker image to ease the pain.
+
+## Instructions for use
+
+Check out the `docker` branch from https://github.com/aaime/gwc-release/tree/docker and enter this directory.
+
+Build the image from the Dockerfile with:
+
+`docker build -t gwc_release:0.1 .`
+
+Run the image, passing in Git credentials as environment variables:
+
+`docker run -it -v d:/tmp/m2:/root/.m2 -e GIT_USERNAME="user" -e GIT_EMAIL="[email protected]" gwc_release:0.1`
+
+Note that the maven repository /root/.m2 is mapped to the host's d:/tmp/m2 for persistence.
+
+Once started, one has to hand-edit the /root/.m2/settings.xml file to add the repo.osgeo.org credentials (OSGeo login, needs nexus permissions suitable for release: geoserver - geowebcache uses geoserver repo) (maybe we could make this also as part of the docker run command above?).
+
+Finally, in order to tag at the end, one needs to create a GitHub personal access token that will be used as the password for that step (go to your user settings, developer settings (right at the bottom, left), and create a personal access token). This could also be avoided by replacing with a step to copy over the identification certificate, and then checkout GWC using the ssh URL.
+
+### Now that docker is set up, you're ready to continue with:
+
 This ruby script allows to automate the release of GeoWebCache.
 
+Requirements
+------------
+
+* Commit access to the https://github.com/GeoWebCache repo (team-geowebcache)
+* GitHub personal access token
+* repo.osgeo.org credentials (OSGeo login) with nexus permissions suitable for release: geoserver
+* SourceForge credentials
+
 Installation
 ------------
 
@@ -37,8 +69,8 @@ export EDITOR=vi
 Also make sure xsddoc in in the path.
 
 
-Releasing a stable release
---------------------------
+Releasing a stable/maintenance release
+--------------------------------------
 
 Assuming one wants to release a GWC 1.9.3, which depends on GeoToools 15.4, then run the following commands:
 
@@ -61,7 +93,9 @@ ruby release.rb --branch 1.9.x --long-version 1.9.3 --short-version 1.9 --gt-ver
 Creating a new branch
 ---------------------
 
-Same as above, but with these instructions:
+This is applicable when preparing the Release Candidate or .0 Initial release
+
+Instead of the 4 ruby commands above, use these commands:
 
 ````
 ruby release.rb --branch main reset