fix: use pwd as mounting point for docker compose

[qoomon]

use pwd as mounting point for docker compose to make relative paths work within docker-compose.yml

[qoomon]

Maven build seems to be broken on master.
mvn test -f shade-test/pom.xml
Picked up _JAVA_OPTIONS: -Xms512m -Xmx1024m
[INFO] Scanning for projects...
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.testcontainers:shade-test:unknown-version has 1 error
[ERROR] Non-resolvable parent POM: Could not find artifact org.testcontainers:testcontainers-parent:pom:1.1.1-SNAPSHOT and 'parent.relativePath' points at wrong local POM @ line 5, column 13 -> [Help 2]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

[rnorth]

Ugh - sorry, will fix. There's a need to update the shade-tests dependency versions after each release - which I'm afraid I haven't automated yet :(

[rnorth]

I see what you meant on #173 now - thanks for the update.