Make the docker images use port 80 (instead of 8000, which is the default in rocket 0.4)

Dockerfile

@@ -64,6 +64,7 @@ RUN cargo build --release
 FROM debian:stretch-slim
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 
 # Install needed libraries

Dockerfile.aarch64

@@ -83,6 +83,7 @@ RUN cargo build --release --target=aarch64-unknown-linux-gnu -v
 FROM resin/aarch64-debian:stretch
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 
 RUN [ "cross-build-start" ]

Dockerfile.alpine

@@ -56,6 +56,7 @@ RUN cargo build --release
 FROM alpine:3.8
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 ENV SSL_CERT_DIR=/etc/ssl/certs
 

Dockerfile.armv7

@@ -83,6 +83,7 @@ RUN cargo build --release --target=armv7-unknown-linux-gnueabihf -v
 FROM resin/armv7hf-debian:stretch
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 
 RUN [ "cross-build-start" ]