Add initial Readme

docker/Makefile

@@ -139,21 +139,21 @@ ubuntu-current-jedi:
 	docker tag ubuntu-current-jedi gerbil/jedi:ubuntu
 
 package-ubuntu:
-	docker run -v $(PWD):/src -t gerbil/ubuntu \
+	docker run -v $(PWD):/src:z -t gerbil/ubuntu \
     bash -c "gem install fpm && \
 	fpm -s dir -p /src/ -t deb -n gerbil-$(GERBIL_VERSION)-gambit-$(GAMBIT_VERSION).ubuntu \
 	--description 'Gambit and Gerbil Package' /opt/gerbil /opt/gambit"
 
 package-fedora:
-	docker run -v $(PWD):/src -t gerbil/fedora \
+	docker run -v $(PWD):/src:z -t gerbil/fedora \
 	bash -c "yum install -y rubygems ruby-devel rpm-build && \
 	gem install fpm && \
 	fpm -s dir -p /src/ -t rpm \
 	-n gerbil-$(GERBIL_VERSION)-gambit-$(GAMBIT_VERSION).fedora \
 	--description 'Gambit and Gerbil Package' /opt/gerbil /opt/gambit"
 
 package-amazonlinux:
-	docker run -v $(PWD):/src -t gerbil/amazonlinux \
+	docker run -v $(PWD):/src:z -t gerbil/amazonlinux \
 	bash -c "amazon-linux-extras install -y ruby2.6 && \
     yum install -y ruby-devel rubygems rpm-build && \
 	gem install fpm && \
@@ -163,10 +163,11 @@ package-amazonlinux:
 
 packages: package-ubuntu package-fedora
 
-push-all: all
+push-all:
 	docker push gerbil/alpine
 	docker push gerbil/ubuntu
 	docker push gerbil/fedora
+	docker push gerbil/amazonlinux
 
 all: alpine amazonlinux fedora ubuntu
 

docker/Readme.org

@@ -0,0 +1,25 @@
+#+title: Instructions for docker and package builds
+
+This directory has a =Makefile= and a =Dockerfile= that support building for multiple
+Linux distributions.
+
+Building a docker for a specific distro is as simple as
+#+begin_src sh
+make <distro>
+#+end_src
+
+Where distro is one of:
+- Alpine
+- AmazonLinux
+- Fedora
+- Ubuntu
+
+** Example
+*** Building the Docker image
+#+begin_src sh
+$ make ubuntu
+#+end_src
+*** Building the .deb/.rpm/.apk
+#+begin_src sh
+make package-ubuntu
+#+end_src