Add bash shell for echo command call

Dockerfile

@@ -33,9 +33,9 @@ RUN   wget -O /tmp/cern-root-ca-2.crt "https://cafiles.cern.ch/cafiles/certifica
       keytool -noprompt -import -cacerts -storepass changeit -alias CERN_CA -file "/tmp/cern-ca.crt" && \
       keytool -noprompt -import -cacerts -storepass changeit -alias CERN_CA_1 -file "/tmp/cern-ca-1.crt" && \
       keytool -noprompt -import -cacerts -storepass changeit -alias CERN_GRID_CA -file "/tmp/cern-grid-ca.crt" && \
-      rm /tmp/*.crt && \
       mkdir -p ~/.ssh && \
-      echo -e "Host gitlab.cern.ch\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config
+      /bin/bash -c 'echo -e "Host gitlab.cern.ch\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config' && \
+      rm /tmp/*.crt
 
 RUN mkdir -p /opt
 ADD src/main/java/SSLPoke.java /opt