Update sync script to support Cloudflare R2 and CDN cache purging

[marcocastignoli]

Instructions to test the script

The script will delete the .git folder, so before proceeding

tmpdir=$(mktemp -d) && cd "$tmpdir"
cp /Users/marcocastignoli/Projects/solc-bin/sync-r2.sh .
git init
echo "hello r2" > nightly-build.txt
git add sync-r2.sh nightly-build.txt
git commit -m "Test payload for R2 sync"

Then set the environment variables

export R2_ACCOUNT_ID=
export R2_ZONE=
export R2_BUCKET_NAME=
export CLOUDFLARE_ZONE_ID=
export CLOUDFLARE_CACHE_HOST=
export CLOUDFLARE_API_TOKEN=
export AWS_ACCESS_KEY_ID=
export AWS_SECRET_ACCESS_KEY=
export AWS_DEFAULT_REGION=

Finally run the script

./sync-r2.sh "$R2_ACCOUNT_ID" "$R2_ZONE" "$R2_BUCKET_NAME" "$CLOUDFLARE_ZONE_ID" "$CLOUDFLARE_CACHE_HOST" "$CLOUDFLARE_API_TOKEN"

[marcocastignoli]

I tested the script locally with some dummy files and it's working. Soon @clonker will run the script with a local copy he has of the full repository.

[r0qs]

Nice. Thanks a lot for that @marcocastignoli! It looks good to me. Just a small comment.

[cameel]

Job name should be updated and perhaps the PR could use a few tweaks (see my comments), but overall seems good.

[cameel]

Looks good to me. Let's try it out!

[cameel]

Oh, just please squash the commits before merging.

Does not have to be one commit, but if there are more, each one should be one logical change that goes straight to the point, without all the back and forth from the review comments, because that's just noise when you look at history and try to figure out what changed.