chore: Move files from /usr/etc/ to /etc/ in build-time (#214)

Take a look at this issue for more details:

blue-build/modules#314

Idk if anything else needs to be done, please tell

Should be tested for regressions too

template/templates/Containerfile.j2

@@ -18,8 +18,8 @@ ARG BASE_IMAGE="{{ recipe.base_image }}"
 
 # Key RUN
 RUN --mount=type=bind,from=stage-keys,src=/keys,dst=/tmp/keys \
-  mkdir -p /usr/etc/pki/containers/ \
-  && cp /tmp/keys/* /usr/etc/pki/containers/ \
+  mkdir -p /etc/pki/containers/ \
+  && cp /tmp/keys/* /etc/pki/containers/ \
   && ostree container commit
 
 # Bin RUN