Fix tcp stacking and concurrency handling #81
Merged
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This PR fixes a bug where the connections from the exporter to the API are stacking indefinitely until file description exhaustion.
It also fixes #82 where current requests led to exporter stale.
This bug was introduced in v1.0.0 and is cause by an unclosed request body.
This PR also adds the linter golangci-lint, runs it in a workflow and fixes currently detected flaws.
Finally the PR takes the chance to upgrade dependencies.