v2023.12.20: ability to regenerate repo manifest from S3 keys

What's Changed

• Ability to regenerate index from files by @vania-pooh in #232
• Fixed string comparison code by @vania-pooh in #233
• Fixed bool expr for regeneration by @vania-pooh in #234
• Default value for build var by @vania-pooh in #235
• Build var type is boolean by @vania-pooh in #236
• More recent checkout action by @vania-pooh in #237
• Better aws s3 cp command for regeneration by @vania-pooh in #238
• Excluding S3 keys in dirs by @vania-pooh in #239

Full Changelog: 2023.12.08...2023.12.20