v1.0.3: Fix tests after brew path removed from github runner

What's Changed

• Demonstrate yaml templating and env var interpolation by @rfay in #2
• Update with #ddev-generated by @rfay in #3
• Add keepalive-workflow to keep workflows alive, fixes #4 by @rfay in #5
• Improve base tests, less noise by @rfay in #6
• Update brew path as no longer provided in image by @rfay in #7

Full Changelog: v1.0.2...v1.0.3