fixed even more environment variables

webhooks-git/Dockerfile

@@ -1,8 +1,23 @@
 FROM        almir/webhook:latest as build
 
 FROM        alpine:latest
+
+# install applications
+
 RUN         apk --no-cache add git openssh-client bash nano gettext
 
+# set environment
+
+ARG WEBHOOK_SECRET
+ENV WEBHOOK_SECRET=${WEBHOOK_SECRET}
+
+ARG GIT_SERVER_ASSETS
+ENV GIT_SERVER_ASSETS=${GIT_SERVER_ASSETS}
+
+ARG GIT_SERVER_PROGRAMM
+ENV GIT_SERVER_PROGRAMM=${GIT_SERVER_PROGRAMM}
+
+# copy binaries and scripts
 COPY        --from=build /usr/local/bin/webhook /usr/local/bin/webhook
 
 COPY        hooks.json.tmpl /etc/webhook/hooks.json.tmpl
@@ -24,5 +39,6 @@ RUN         chmod +x /etc/webhook/programm-init.sh
 
 WORKDIR     /etc/webhook
 EXPOSE      9000
+
 ENTRYPOINT  ["/etc/webhook/entrypoint.sh"]
 CMD [""]