feat(docker): add Ubuntu 26.04 (Resolute Raccoon) image #2919

Job	Run time
stable (ubuntu-latest, chrome)	9m 39s
stable (windows-latest, chrome)	13m 8s
Java_21 (chromium)	6m 11s
Java_21 (webkit)	10m 32s
Java_21 (firefox)	12m 20s
dev (ubuntu-latest, firefox)	13m 56s
stable (macos-latest, chrome)	13m 20s
dev (macos-latest, chromium)	7m 18s
dev (ubuntu-latest, webkit)	14m 12s
dev (macos-15-xlarge, webkit)	6m 57s
dev (windows-latest, webkit)	12m 25s
dev (macos-latest, firefox)	19m 52s
dev (windows-latest, firefox)	22m 53s
dev (ubuntu-latest, chromium)	6m 56s
stable (windows-latest, msedge)	15m 33s
dev (windows-latest, chromium)	11m 8s
stable (macos-latest, msedge)	11m 39s
	3h 27m 59s

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