tools: Fix containerd commit environment
Commit ("test: add test-containerd") added
the containerd commit hash to the alpine base image.
Unfortunately, setting it as ARG does not work and it
needs to be set with ENV for other builds to pick it up.
@@ -55,4 +55,4 @@ COPY --from=shellcheck /usr/local/lib/ /usr/local/lib/
RUN apk update && apk upgrade -a
-ARG CONTAINERD_COMMIT=c215531a8f63a98a69134e804fea4ee6d354bb90
+ENV CONTAINERD_COMMIT=c215531a8f63a98a69134e804fea4ee6d354bb90
