build: add argument to specify build directory to deploy

This commit modifies the script
`deploy/build_env/services-linux/run_asapo.sh` so that we can use it
to deploy services compiled in a directory other than `build/`. This is
very convenient during development on a local machine  because we may
want to store different build flavors in directories under the `build/`
directory.

Note: if no directory is passed to the script, the script uses the
`build/` directory by default.

deploy/build_env/services-linux/run_asapo.sh

-cp build/authorizer/asapo-authorizer /asapo-authorizer
-cp build/discovery/asapo-discovery /asapo-discovery
-cp build/broker/asapo-broker /asapo-broker
-cp build/file_transfer/asapo-file-transfer  /asapo-file-transfer
-cp build/receiver/receiver /receiver
-cp build/monitoring/monitoring_server/asapo-monitoring-server /asapo-monitoring-server
+#!/bin/bash
 
+# The value of `source_build_dir` is either "$1" or "build" if no argument is provided
+# to the script.
+source_build_dir="${1:-build}"
+
+cp "$source_build_dir"/authorizer/asapo-authorizer /asapo-authorizer
+cp "$source_build_dir"/discovery/asapo-discovery /asapo-discovery
+cp "$source_build_dir"/broker/asapo-broker /asapo-broker
+cp "$source_build_dir"/file_transfer/asapo-file-transfer /asapo-file-transfer
+cp "$source_build_dir"/receiver/receiver /receiver
+cp "$source_build_dir"/monitoring/monitoring_server/asapo-monitoring-server /asapo-monitoring-server
 
 cp deploy/asapo_services_light/*json /
 cp deploy/asapo_services_light/envoy.yaml /
@@ -18,7 +23,7 @@ cp deploy/build_env/services-linux/discovery.json /
 cp deploy/build_env/services-linux/*key /
 cp deploy/build_env/services-linux/supervisord.conf /etc/
 
-cp build/deploy/asapo_services_light/nginx.conf /etc/nginx/nginx.conf
+cp "$source_build_dir"/deploy/asapo_services_light/nginx.conf /etc/nginx/nginx.conf
 
 service slapd start
 ldapadd -x -D "ou=rgy,o=desy,c=de" -f /etc/ldap/record.ldif -h localhost
@@ -26,4 +31,3 @@ ldapadd -x -D "ou=rgy,o=desy,c=de" -f /etc/ldap/record.ldif -h localhost
 cd / && supervisord --configuration /etc/supervisord.conf &
 sleep 20
 cd -
-