maint: add local dev notes and fix example #233
Merged
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Which problem is this PR solving?
Short description of the changes
DEVELOPING.md
for when occasional maintenance is necessarydatadog/squid
image in the rails52 example withubuntu/squid
because the former has been removed from dockerGemfile.lock
to the.gitignore
file - we already intentionally don't check it in, so this just makes it less likely to inadvertently check it in