jenkins-test: ensure gpg is starting from a clean and proper place

There have been frequent failures on import, some bugs suggest that it
might be because these dirs are missing.  They would get wiped by a
`git clean -fdx`.

jenkins-test

@@ -38,6 +38,10 @@ rm -f config.py keystore.jks
 ../fdroid update
 
 export GNUPGHOME=$WORKSPACE/tests/gnupghome
+if [ ! -e $GNUPGHOME/private-keys-v1.d ]; then
+    mkdir -p $GNUPGHOME/private-keys-v1.d
+    chmod 0700 $GNUPGHOME/private-keys-v1.d
+fi
 gpg --import $GNUPGHOME/secring.gpg
 
 echo "build_server_always = True" >> config.py