Fix docker release workflow (#4980)

* scripts: fix polkadot_injected_release gpg errors

* ci: publish-docker-release: remove keyserver arg

* scripts: join RUNs in polkadot_injected_release

polkadot/.github/workflows/publish-docker-release.yml

@@ -38,7 +38,6 @@ jobs:
             POLKADOT_VERSION=${{ github.event.release.tag_name }}
             VCS_REF=${{ github.ref }}
             BUILD_DATE=${{ github.event.release.published_at }}
-            GPG_KEYSERVER="hkps://keys.mailvelope.com"
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache
       - name: Image digest

polkadot/scripts/dockerfiles/polkadot_injected_release.Dockerfile

@@ -5,7 +5,7 @@ ARG VCS_REF
 ARG BUILD_DATE
 ARG POLKADOT_VERSION
 ARG POLKADOT_GPGKEY=9D4B2B6EB8F97156D19669A9FF0812D491B96798
-ARG GPG_KEYSERVER="hkps://keys.mailvelope.com"
+ARG GPG_KEYSERVER="keyserver.ubuntu.com"
 
 LABEL io.parity.image.authors="devops-team@parity.io" \
 	io.parity.image.vendor="Parity Technologies" \
@@ -27,7 +27,7 @@ RUN apt-get update && \
 		gnupg && \
 	useradd -m -u 1000 -U -s /bin/sh -d /polkadot polkadot && \
 # add repo's gpg keys and install the published polkadot binary
-	gpg --recv-keys --keyserver ${GPG_KEYSERVER} ${POLKADOT_GPGKEY} && \
+	gpg --keyserver ${GPG_KEYSERVER} --recv-keys ${POLKADOT_GPGKEY} && \
 	gpg --export ${POLKADOT_GPGKEY} > /usr/share/keyrings/parity.gpg && \
 	echo 'deb [signed-by=/usr/share/keyrings/parity.gpg] https://releases.parity.io/deb release main' > /etc/apt/sources.list.d/parity.list && \
 	apt-get update && \