ansible: install gcc-10 in remaining Ubuntu 20.04 containers (#3495)

Refs: #3493 (comment)
Refs: #3485 (comment)

Author: richardlau

ansible/roles/docker/templates/ubuntu2004.Dockerfile.j2

@@ -18,6 +18,8 @@ RUN apt-get update && apt-get dist-upgrade -y && apt-get install -y \
     ccache \
     g++-8 \
     gcc-8 \
+    g++-10 \
+    gcc-10 \
     git \
     openjdk-17-jre-headless \
     curl \

ansible/roles/docker/templates/ubuntu2004_armv7l.Dockerfile.j2

@@ -16,6 +16,8 @@ ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && apt-get dist-upgrade -y && apt-get install -y ccache \
       g++-8 \
       gcc-8 \
+      g++-10 \
+      gcc-10 \
       git \
       openjdk-17-jre-headless \
       pkg-config \