Fix time formatter and release version 1.0.0

• Output absolute time are now formatted with a trailing Z (UTC Zulu):

2024-01-01T12:34:56.789Z

• Output relative time are now formatted with explicit leading sign (+|-) and days digits:

+000.12:34:56.789

• Bump version to 1.0.0

• Add gitlab-ci configuration to automatically publish release and tag on version change

• Fix gitlab-ci changes on .gitlab-ci as changes trigger

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Fix #7 (closed)