CI: run on maintenance branches prefixed with "maint-" #1285

Job	Run time
check-packages	5m 31s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	3m 56s
changelog	17s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 19s
build-binaries	9m 42s
lints	5m 15s
rust-docs	6m 7s
test-integration	20m 5s
check-benchmarks	10m 27s
test-unit	10m 36s
test-wasm	7m 2s
test-e2e-with-device-automation	8m 39s
test-e2e (0)	21m 33s
test-e2e (1)	20m 11s
test-e2e (2)	21m 41s
test-e2e (3)	21m 13s
test-e2e (4)	17m 59s
upload-coverage	10s
	3h 13m 43s

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