Adding opensuse leap docker

FossilOrigin-Name: 38bcacc794e378761466d91d9872f40b54692c942cc64c9bfba46d9195b9e0fe

opensuse.md

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+# A simple base docker image for OpenSuse
+
+My OpenSuse Docker Images are pretty standard. Nothing specific here. Currently
+the default version is opensuse/leap:15.
+
+Note: I run OpenSuse Tumbleweed on my desktop, but my container work with OpenSuse is using OpenSuse Leap.
+
+## OpenSuse Leap Docker Image
+
+### Setup FROM and enable a version choice.
+
+First let's set the where we'll pull from. I use `podman` and `docker` equally, so on I give the full path to the FROM image.
+
+An `ARG` for the version, `VER` is there. This can be overridden with `--build-arg 'VER=<version>'`.
+
+```
+<<base.image>>=
+ARG VER=15
+FROM docker.io/opensuse/leap:${VER}
+@  % def VER
+```
+
+### Setup user specific arguments.
+
+Setup a base username, uid, gid, and work directory with some defaults. All of these can be overridden with `-build-arg "ARG=VALUE"`.
+
+```
+<<base.userargs>>=
+ARG baseUSER="mat.kovach"
+ARG baseUID=5000
+ARG baseGID=5000
+ARG baseDIR="/work"
+@
+```
+
+### Add user and work directory
+
+You'll need to be careful here to not change a current directory. For example, do not set baseDIR="/bin". 
+
+Add the group, user, (with the home directory of the user ad the work directory) and insure the proper ownership on the work directory.
+
+```
+<<base.setupuser>>=
+RUN groupadd -g ${baseGID} ${baseUSER} &&      \
+    useradd -c 'work user' -m -u ${baseUID}    \
+    -g ${baseGID} -d ${baseDIR} ${baseUSER} && \ 
+    chown -R ${baseUID}:${baseGID} ${baseDIR}
+@
+```
+
+### Add repos and update software.
+
+First, we'll add any additional repo. If you have additional repos you want to 
+enable, add them here.
+
+```
+<<base.enablerepos>>=
+# nothing to do here, carry on!
+@
+```
+
+### Addtional root changes
+
+We are still root at this point, this is where we add software, make 
+additional changes, etc.
+
+```
+<<base.addsoftware>>=
+RUN zypper ref &&             \
+    zypper -n up &&           \
+    zypper -n in ed joe tcl
+@
+```
+
+The different sections are setup based on how often they may be changed. 
+The more likely some will change, the further down they should be to help 
+minimize the layers that need to be rebuilt.
+
+### Make sure we the user, volume, and workdir setup
+
+```
+<<base.end>>=
+USER ${baseUSER}
+VOLUME ${baseDIR}
+WORKDIR ${baseDIR}
+# you can add entry point, etc. here.
+@
+```
+
+### Pulling it all together
+
+```
+<<opensuse.dockerfile>>=
+<<base.image>>
+<<base.userargs>>
+<<base.setupuser>>
+<<base.enablerepos>>
+<<base.addsoftware>>
+<<base.end>>
+@
+```
+## build and test
+`docker build -t mek:opensuse -f opensuse.dockerfile .`
+`docker run --rm -it mek:opensuse /bin/bash`
+```