Fix Dockerfiles to add missing apt-update before apt-install

Change-Id: I639aed00e74c64e770566ce50de10e193e8b8d01
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/docker/osmclient/Dockerfile b/docker/osmclient/Dockerfile
index e5e1f30..d647154 100644
--- a/docker/osmclient/Dockerfile
+++ b/docker/osmclient/Dockerfile
@@ -32,7 +32,8 @@
     python3-setuptools=45.2.* \
     curl=7.68.*
 
-RUN DEBIAN_FRONTEND=noninteractive apt-get --yes install \
+RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
+    DEBIAN_FRONTEND=noninteractive apt-get --yes install \
     libcurl4-openssl-dev=7.68.* \
     libssl-dev=1.1.*