chore(deps): update alpine docker tag to v3.15

See merge request !4

breaking: Move to gitlab-ci-cd:1.0.4 which deprecates armv7 images. Staying up-to-date is more important than supporting old platforms. Sorry, you may need to consider getting a Raspberry Pi 4.

chore(deps): update griefed/gitlab-ci-cd docker tag to v1.0.3

See merge request !3

chore(deps): update griefed/gitlab-ci-cd docker tag to v1.0.1

See merge request !2

perf: Deactivafe force-unsafe-io. I'd rather builds take a couple of seconds longer than risking failures due to disabled safety features.