Fix openEuler 20.04-lts (#83)

* Remove: Manual installation of repos and gpg-keys for openEuler 20.03-lts

* Change: Skip installation of dependencies for openEuler 20.03-lts

* Remove: Unnecessary dependencies

operating_systems/openeuler/Dockerfile

@@ -5,14 +5,11 @@ FROM ${BASEIMAGE}:${TAG}
 ARG UPDATED=false
 ARG TAG
 
-RUN if [ "$TAG" = "20.03-lts" ]; then dnf install -y \
-    https://repo.openeuler.org/openEuler-20.03-LTS/update/x86_64/Packages/openEuler-gpg-keys-1.0-2.9.oe1.x86_64.rpm \
-    https://repo.openeuler.org/openEuler-20.03-LTS/update/x86_64/Packages/openEuler-repos-1.0-2.9.oe1.x86_64.rpm; fi
 RUN if [ "$UPDATED" = true ]; then dnf upgrade -y; fi \
-    && dnf install -y openssh-server passwd shadow-utils\
+    && if [ "$TAG" != "20.03-lts" ]; then dnf install -y openssh-server; fi \
     && dnf clean all \
     && useradd demo \
-    && echo "demo" | passwd --stdin demo \
+    && echo "demo:demo" | chpasswd \
     && ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N "" \
     && ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N "" \
     && ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ""