ci/deqp: split vk and gl builds
Split the VK and the GL build of dEQP, and limit how much is built & stored to what we actually use.
Side effect: the test images and the rootfs tarballs are now smaller and take less time to build :)
| build: minutes | before | after |
|---|---|---|
| debian/x86_64_test-android | 25 | 15 |
| debian/x86_64_test-gl | 35 | 16 |
| debian/x86_64_test-vk | 31 | 20 |
| kernel+rootfs_arm32 | 18 | 11 |
| kernel+rootfs_arm64 | 14 | 13 |
| kernel+rootfs_x86_64 | 59 | 43 |
| size: MB, compressed (uncompressed) | before | after |
|---|---|---|
| debian/x86_64_test-android | 1845 (17192) | 1692 (15678) |
| debian/x86_64_test-gl | 712 (2592) | 613 (1805) |
| debian/x86_64_test-vk | 1194 (4042) | 1098 (3746) |
| kernel+rootfs_arm32 | 380 (1741) | 337 (1629) |
| kernel+rootfs_arm64 | 547 (2469) | 502 (2331) |
| kernel+rootfs_x86_64 | 973 (3878) | 924 (3718) |