:bug: Fix shell in Makefile

[tmshort]

Description

Reviewer Checklist

• [ ] API Go Documentation
• [ ] Tests: Unit Tests (and E2E Tests, if appropriate)
• [ ] Comprehensive Commit Messages
• [ ] Links to related GitHub Issue(s)

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[codecov[bot]]

Codecov Report

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

Project coverage is 71.04%. Comparing base (9bbc444) to head (7d79d65).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #839 +/- ## ======================================= Coverage 71.04% 71.04% ======================================= Files 16 16 Lines 1278 1278 ======================================= Hits 908 908 Misses 300 300 Partials 70 70 ``` | [Flag](https://app.codecov.io/gh/operator-framework/operator-controller/pull/839/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/operator-framework/operator-controller/pull/839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | `42.25% <ø> (ø)` | | | [unit](https://app.codecov.io/gh/operator-framework/operator-controller/pull/839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | `63.59% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework#carryforward-flags-in-the-pull-request-comment) to find out more.

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[tmshort]

TL;DR: The CI was apparently using /bin/sh, and so, non-fatal errors occurred:

/bin/sh: 1: [[: not found
/bin/sh: 1: /home/runner: Permission denied

The SHELL variables was redefined to be bash, but it was done after some $(shell) lines.

[grokspawn]

Noice! I saw those errors this morning and put them on my to-do list, but I wasn't sure where to start.