ci/test-ledger-app: specify container image #1633

Job	Run time
build-binaries	10m 51s
changelog	16s
check-packages	5m 6s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	4m 6s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 41s
lints	5m 35s
rust-docs	6m 21s
test-ledger-app	30s
check-benchmarks	11m 14s
test-wasm	7m 30s
test-unit	11m 15s
test-integration	23m 11s
test-e2e (0)	21m 51s
test-e2e-with-device-automation	9m 29s
test-e2e (1)	18m 41s
test-e2e (2)	22m 20s
test-e2e (3)	22m 11s
test-e2e (4)	23m 30s
upload-coverage	14s
	3h 27m 52s

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