Add BOOTSNAP_READONLY to Dockerfile template for production

This was added in back in bootsnap 1.15.0 (Shopify/bootsnap#428). This can save extra work and IO when the cache won't be changed, like is the case for docker containers
technicalpickles · Nov 15, 2023 · 1aa7602 · 1aa7602
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commit 1aa7602
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diff --git a/railties/lib/rails/generators/rails/app/templates/Dockerfile.tt b/railties/lib/rails/generators/rails/app/templates/Dockerfile.tt
@@ -64,6 +64,8 @@ COPY . .
 # Precompile bootsnap code for faster boot times
 RUN bundle exec bootsnap precompile app/ lib/
 
+# Switch to read-only since any cache changes after this point won't persist between containers
+ENV BOOTSNAP_READONLY="1"
 <% end -%>
 <% unless dockerfile_binfile_fixups.empty? -%>
 # Adjust binfiles to be executable on Linux