add Dockerfile to trigger netdisco-docker

Dockerfile

@@ -0,0 +1,14 @@
+# vim: ft=Dockerfile
+FROM docker.io/alpine:3.7
+
+ARG TAG
+ENV TAG ${TAG:-2.000000}
+
+RUN apk add --no-cache \
+  curl
+
+RUN curl -u "$GHTOKID:$GHTOKVAL" \
+  --data '{"tag_name": "$TAG", "target_commitish": "og-import-irasnyd"}' \
+  "https://api.github.com/repos/netdisco/netdisco-docker/releases"
+
+CMD ["sh"]

MANIFEST.SKIP

@@ -73,3 +73,4 @@ logs/.*
 .github
 .travis
 README.md
+Dockerfile