set default goal since bingo disrupts it

[grokspawn]

Description of the change: set a default goal of all for the Makefile

Motivation for the change: since https://github.com/operator-framework/operator-registry/commit/7a1b8ec63f4bd6d88d9b9380fd812a7d6ec0097c the all goal is no longer the first (and therefore default-by-default) goal. This explicitly makes it the default target again.

Reviewer Checklist

• [ ] Implementation matches the proposed design, or proposal is updated to match implementation
• [ ] Sufficient unit test coverage
• [ ] Sufficient end-to-end test coverage
• [ ] Docs updated or added to /docs
• [ ] Commit messages sensible and descriptive

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 48.47%. Comparing base (a9fd06a) to head (742f67e). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1447 +/- ## ======================================= Coverage 48.47% 48.47% ======================================= Files 136 136 Lines 12814 12814 ======================================= Hits 6212 6212 Misses 5561 5561 Partials 1041 1041 ```

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[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: everettraven, grokspawn, joelanford

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/operator-framework/operator-registry/blob/master/OWNERS)~~ [grokspawn,joelanford] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment