fix(images): use noninteractive apt-get frontend (#975)

diff --git a/images/Earthfile b/images/Earthfile
index 0a4374a..32cab4a 100644
--- a/images/Earthfile
+++ b/images/Earthfile
@@ -5,7 +5,7 @@
   ARG PACKAGES
   RUN \
     apt-get update && \
-    apt-get install --no-install-recommends -y ${PACKAGES} && \
+    DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y ${PACKAGES} && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*