Dockerfiles: correct ENV format

Avoid docker warning:

   - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format

docker/Dockerfile.base.rhel9

@@ -67,7 +67,7 @@ RUN rm -f /etc/rhsm-host && \
 
 # Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
 # it will be copied into target containers, to print exit numbers and handle signals properly
-ENV TINI_VERSION v0.19.0
+ENV TINI_VERSION=v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
 RUN chmod +x /tini
 

docker/Dockerfile.base.rocky

@@ -48,7 +48,7 @@ RUN dnf install 'dnf-command(config-manager)' -y && \
 
 # Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
 # it will be copied into target containers, to print exit numbers and handle signals properly
-ENV TINI_VERSION v0.19.0
+ENV TINI_VERSION=v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
 RUN chmod +x /tini
 

docker/Dockerfile.base.ubuntu22

@@ -57,7 +57,7 @@ RUN apt-get update && \
 
 # Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
 # it will be copied into target containers, to print exit numbers and handle signals properly
-ENV TINI_VERSION v0.19.0
+ENV TINI_VERSION=v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
 RUN chmod +x /tini
 

docker/Dockerfile.base.ubuntu22.cross-arm64

@@ -74,7 +74,7 @@ RUN apt-get update && \
 
 # Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
 # it will be copied into target containers, to print exit numbers and handle signals properly
-ENV TINI_VERSION v0.19.0
+ENV TINI_VERSION=v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
 RUN chmod +x /tini