fix(docker): Make importing custom certificates work

When custom certificates are passed to the `import_certificates.sh`
script that are mounted into the container (which should be the default
scenario), the import to the system certificates store does not happen
because the `update-ca-certificates` script ignores symbolic links. To
fix this, make sure that the custom certificate files are copied to
"real" files.

Signed-off-by: Oliver Heger <oliver.heger@bosch.com>

Author: oheger-bosch

scripts/import_certificates.sh

@@ -55,5 +55,5 @@ fi
 
 # Also add the certificates to the system certificates, e.g. for curl to work.
 echo "Adding certificates to the system certificates..."
-cp -r "$FILE_PREFIX"* /usr/local/share/ca-certificates/
+cp -L -r "$FILE_PREFIX"* /usr/local/share/ca-certificates/
 update-ca-certificates