ioc: copy locally installed software from build stages.

Extra software may be built in the first stages, but are currently not
available in the resulting IOC image. Copy the entire `/usr/local` tree
in all IOC stages, so that locally installed binaries, libraries and
configuration files can be used at runtime.

This allows us to build patched versions of tools (e.g. procServ) during
build phases and install them at IOC images, centralizing and making it
easier to track how they are built.

In addition, IOCs can also install custom files which will be available
at runtime in a known location. Also, IOCs themselves can also be
installed in FHS-compliant paths [1] inside the container as any other
packaged software, allowing them the use of conventional system software
in a straightforward manner (such as `env` executable discovery).

[1] https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s09.html

Author: henriquesimoes

CHANGES.md

@@ -6,6 +6,10 @@
 
 * base: add lakeshore340 module. by @guirodrigueslima in
   https://github.com/cnpem/epics-in-docker/pull/123
+* ioc: copy locally installed software from build stages. by @henriquesimoes in
+  https://github.com/cnpem/epics-in-docker/pull/55
+  * This allows the IOC build phase to install custom software, available at
+    runtime, under `/usr/local` tree for all targets.
 
 ## v0.14.1
 

Dockerfile

@@ -71,6 +71,7 @@ LABEL br.lnls.epics-in-docker.rundir=${RUNDIR}
 LABEL br.lnls.epics-in-docker.target="no-build"
 
 COPY --from=pruned-build /opt /opt
+COPY --from=pruned-build /usr/local /usr/local
 
 
 FROM build-image AS build-stage
@@ -117,6 +118,7 @@ LABEL br.lnls.epics-in-docker.rundir=${RUNDIR}
 LABEL br.lnls.epics-in-docker.target="dynamic-link"
 
 COPY --from=dynamic-build /opt /opt
+COPY --from=dynamic-build /usr/local /usr/local
 
 
 FROM build-stage AS static-build
@@ -137,3 +139,4 @@ ARG REPONAME
 LABEL br.lnls.epics-in-docker.target="static-link"
 
 COPY --from=static-build /opt/${REPONAME} /opt/${REPONAME}
+COPY --from=static-build /usr/local /usr/local