fix entrypoint, take two

(cherry picked from commit e1103076e9bf133e9f22cb25519a2e762f0bce39)

create_dockerfile.sh

@@ -50,10 +50,10 @@ VOLUME /etc/kamailio
 RUN apt-get clean && rm -rf /var/lib/apt/lists/*
 
 # set SHM_MEMORY and PKG_MEMORY from ENV
-ENV SHM_MEMORY=\${SHM_MEMORY:-64}
-ENV PKG_MEMORY=\${PKG_MEMORY:-8}
+ENV SHM_MEMORY=${SHM_MEMORY:-64}
+ENV PKG_MEMORY=${PKG_MEMORY:-8}
 
-ENTRYPOINT ["kamailio", "-DD", "-E", "-m \${SHM_MEMORY}", "-M \${PKG_MEMORY}"]
+ENTRYPOINT kamailio -DD -E -m \${SHM_MEMORY} -M \${PKG_MEMORY}
 EOF
 }