Add docker support

Based on alpine image, runs as a regular user

Dockerfile

@@ -0,0 +1,25 @@
+FROM alpine:edge
+
+COPY ./ /tmp
+
+WORKDIR /tmp
+
+RUN apk update \
+  && apk add --no-cache ca-certificates \
+                        libressl \
+                        llvm-libunwind \
+  && apk add --no-cache --virtual .build-rust \
+    rust \
+    cargo \
+    libressl-dev \
+  && cargo build --release \
+  && mv target/release/iptoasn-webservice /usr/bin/iptoasn-webservice \
+  && rm -rf  ~/.cargo \
+            /var/cache/apk/* \
+            /tmp/* \
+  && apk del .build-rust
+
+RUN adduser -D app
+USER app
+
+ENTRYPOINT /usr/bin/iptoasn-webservice --listen 0.0.0.0:10000