Add CI to build docker images on releases (#836)

* Fix the url of the fetched file

* Fix binary in the GPG check

* Add docker build

* Import GPG pub keys

* Copy missing binaries

* Checkout first

* Add missing mkdir

* Set bin as executable

* Fix exec flag earlier

* Fix docker calls

* Fix version parsing

* Fix image names

* Cleanup

* Fix ENV issue

* Only allow user keys on pre-releases

* Add Docker Hub token and enable pushing

* Make Docker owner configurable via secrets

* Fix owner

* Remove duplicate secret

docker/injected.Dockerfile

@@ -36,6 +36,8 @@ RUN apt-get update && \
 
 # add polkadot-collator binary to the docker image
 COPY ./target/release/polkadot-collator /usr/local/bin
+COPY ./target/release/polkadot-collator.asc /usr/local/bin
+COPY ./target/release/polkadot-collator.sha256 /usr/local/bin
 COPY ./polkadot-parachains/res/*.json /specs/
 
 USER polkadot

docker/scripts/build-injected-image.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-OWNER=parity
-IMAGE_NAME=polkadot-collator
+OWNER=${OWNER:-parity}
+IMAGE_NAME=${IMAGE_NAME:-polkadot-collator}
 docker build --no-cache --build-arg IMAGE_NAME=$IMAGE_NAME -t $OWNER/$IMAGE_NAME -f ./docker/injected.Dockerfile .
 docker images | grep $IMAGE_NAME