deploy: add build using epics-in-docker musl image.

musl allows us to produce a fully static binary, which can be deployed
on almost any machine.

The intended deployment directory is /opt/rffe-epics-ioc, so that's
where we build the IOC, to guarantee that envPaths has the correct
definitions.

build-ioc.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+set -ex
+
+cp /opt/epics/RELEASE configure/
+cat << EOF > configure/CONFIG_SITE.local
+STATIC_BUILD=YES
+FULL_STATIC_BUILD=YES
+USR_LDFLAGS = -static-pie
+# TODO: add to base image
+COMMANDLINE_LIBRARY = READLINE_NCURSES
+EOF
+
+# TODO: add to base image
+apk add git ncurses-static
+
+git config --global --add safe.directory $PWD
+
+make distclean
+make
+make clean
+make -C iocBoot
+
+version=$(git describe)
+
+echo $version > rffe-epics-ioc-version
+echo ".git/" > /tmp/globs
+# this trick is done so the resulting tarball has a root rffe-epics-ioc/ directory
+(cd .. && tar caf rffe-epics-ioc/rffe-epics-ioc-${version}.tar.gz -X /tmp/globs rffe-epics-ioc/)
+rm rffe-epics-ioc-version
+
+make distclean

docker-compose.yml

@@ -0,0 +1,9 @@
+services:
+  build-static-ioc:
+    image: ghcr.io/cnpem/lnls-alpine-3.18-epics-7:v0.10.0-dev
+    volumes:
+      - type: bind
+        source: ./
+        target: /opt/rffe-epics-ioc
+    working_dir: /opt/rffe-epics-ioc
+    command: ./build-ioc.sh