fix(docker): update base images and entrypoints

Update Fedora and Ubuntu Dockerfiles to use fully qualified image names
from docker.io/library. Change ENTRYPOINT to exec form for consistency.
Remove redundant yum install from Fedora Dockerfile. Minor formatting
improvements in install-node.sh.

Author: mkoura

cabal_build_tests/fedora/Dockerfile

@@ -1,12 +1,10 @@
-FROM fedora:latest
+FROM docker.io/library/fedora:latest
 
 # workaround for timezone manual intervention
 ENV TZ=Europe/London
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
 COPY install-node.sh /
-RUN yum update -y \
-    && yum install curl diffutils awk -y \
-    && chmod +x /install-node.sh
+RUN chmod +x /install-node.sh
 
-CMD ./install-node.sh
+ENTRYPOINT ["./install-node.sh"]

cabal_build_tests/install-node.sh

@@ -45,6 +45,7 @@ else
 fi
 
 # Install dependencies
+
 echo "Install dependencies"
 if [[ "$(</etc/os-release)" == *"fedora"* ]]; then
   echo "Running on Fedora"

cabal_build_tests/ubuntu/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM docker.io/library/ubuntu:latest
 
 # workaround for timezone manual intervention
 ENV TZ=Europe/London
@@ -9,4 +9,4 @@ RUN apt-get update -y \
     && apt-get install curl -y \
     && chmod +x /install-node.sh
 
-ENTRYPOINT ./install-node.sh
+ENTRYPOINT ["./install-node.sh"]