fdroid, begin maintaining a consistent keystore file.

Config/F-DroidRepo/Dockerfile

@@ -202,6 +202,10 @@ RUN [ ! -z "$REPO_ICON" ] && \
 
 RUN fdroid update -c
 
+# Install Keystore #
+
+COPY files/keystore.p12 "$FDROID"/keystore.p12
+
 # Publish Repo Contents to Web Root #
 
 RUN cp -rv "$FDROID" "$WEBROOT/"