Helm operator 1.1.0

This is the first minor release, it focuses on metrics improvements,
state logic improvements, and the fixing of spurious disk usage bug
due to anonymous index files not getting cleaned up in Helm 3.

Bug fixes

• release: reset recorded failure cond on dry-run fluxcd/helm-operator{#385, #425}
• release: imply release failure upon chart fetch failure fluxcd/helm-operator#399
• helm/v3: garbage collect anonymous index files fluxcd/helm-operator#422

Enhancement

• release: keep track of last attempted revision fluxcd/helm-operator#382
• metrics: add release_count to expose number of Helm Operator managed releases fluxcd/helm-operator#387
• metrics: add release_condition_info condition gauge fluxcd/helm-operator#403
• metrics: introduce release_action_duration_seconds as a replacement for release_phase_duration_seconds fluxcd/helm-operator#407
• metrics: add 600 and 1800 duration buckets fluxcd/helm-operator#407
• operator: fix typo in synchronization log fluxcd/helm-operator#411
• chartsync/git: allow selecting cross-namespace secrets for HTTPS credentials fluxcd/helm-operator#421

Maintenance and documentation

• docs: improvements to contributing documentation fluxcd/helm-operator#297
• docs: fix link-checking and a number of links fluxcd/helm-operator#347
• docs: improve monitoring documentation fluxcd/helm-operator#384
• build: update Go to 1.14.x fluxcd/helm-operator#386
• e2e: fix tests on MacOS fluxcd/helm-operator#400

Thanks

Thanks to @stefansedich, @sa-spag, @dholbach, @seaneagan, @stefanprodan, @vladlosev, @fllaca, @hiddeco, @Sayrus, @squaremo, and others for their contributions to this release, feedback, and reporting issues.