Use gz- projects on Homebrew CI

[chapulina]

• Requires Add gz- aliases for all stable ignition- versions osrf/homebrew-simulation#1984
• The intention is to fix CI for ⬆️ Bump main to 4.0.0~pre1 gazebosim/gz-cmake#296

Test build using this PR together with the 2 above:

---

Ah had to rebuild the DSL with this branch:

Build after rebuilding the DSL:

Annnd I built the wrong DSL before, I think this should do it:

New new build:

---

After 465385a

Another DSL

New new new build:

---

After ef6148b

DSLs

• 
• 

Build:

[chapulina]

Success!

+ brew install gz-cmake4 --only-dependencies
...
==> Installing ignition-cmake3 from osrf/simulation
==> Installing dependencies for osrf/simulation/ignition-cmake3: pkg-config
==> Installing osrf/simulation/ignition-cmake3 dependency: pkg-config
==> Pouring pkg-config--0.29.2_3.big_sur.bottle.tar.gz

[j-rivero]

Any particular reason not to use the new gz- and use the legacy instead?

[chapulina]

That was my first approach, and the test run showed that more things would need to be changed, so I though of keeping this PR to the strictly necessary for now.

[j-rivero]

The CI includes the testing of bottles so we are going to need to modify the bottle name var in DSL when new gz- bottles are created. We can create a different PR for this if you prefer to keep this one small and go fast.

[j-rivero]

Minor comment about not using the legacy mechanism but looks good in either way.

[chapulina]

The CI includes the testing of bottles so we are going to need to modify the bottle name var in DSL when new gz- bottles are created.

I hadn't realized that. So is merging this PR going to break anything? I thought I was only affecting these CI jobs:

• ignition_${ign_sw}-ci-pr_any-homebrew-amd64
• ignition_${ign_sw}-ci-${branch}-homebrew-amd64
• ignition_${ign_collection_name}-ci-main-homebrew-amd64

[j-rivero]

I hadn't realized that. So is merging this PR going to break anything? I thought I was only affecting these CI jobs:

It is not going to break anything, I was reviewing the status of other things affected by migration as part of Homebrew CI.