Avoid here-string in run.sh.

The Dash shell (possibly among others) does not support here-strings, so
we use a classic pipe instead.

closes #1301

Author: gouttegd

template/src/ontology/run.sh.jinja2

@@ -77,7 +77,7 @@ ODK_TAG=${ODK_TAG:-latest}
 ODK_JAVA_OPTS=${ODK_JAVA_OPTS:-{{ project.robot_java_args }}}
 {% else %}
 if [ -z "$USE_SINGULARITY" ]; then
-    {% raw %}DEFAULT_MAX_MEM=$(bc <<<"($(docker info --format={{.MemTotal}}) * .9) / (1024*1024*1024)")G{% endraw %}
+    {% raw %}DEFAULT_MAX_MEM=$(echo "($(docker info --format={{.MemTotal}}) * .9) / (1024*1024*1024)" | bc)G{% endraw %}
 else
     DEFAULT_MAX_MEM=8G
 fi