Add build job for issuer front end. #281

Job	Run time
lint:check-frontends (examples/some-verifier/frontend)	45s
lint:check-frontends (examples/some-issuer/frontend)	51s
lint:fmt (services/web3id-issuer/Cargo.toml)	13s
lint:fmt (services/web3id-verifier/Cargo.toml)	12s
lint:fmt (test-tools/web3id-test/Cargo.toml)	11s
lint:fmt (test-tools/issuer-front-end/backend/Cargo.toml)	14s
lint:fmt (examples/bots/discord-bot/Cargo.toml)	13s
lint:fmt (examples/bots/telegram-bot/Cargo.toml)	10s
lint:fmt (examples/some-issuer/Cargo.toml)	13s
lint:fmt (examples/some-verifier/Cargo.toml)	12s
lint:fmt (examples/some-verifier-lib/Cargo.toml)	13s
lint:clippy (services/web3id-issuer/Cargo.toml)	1m 23s
lint:clippy (services/web3id-verifier/Cargo.toml)	1m 13s
lint:clippy (test-tools/web3id-test/Cargo.toml)	1m 17s
lint:clippy (test-tools/issuer-front-end/backend/Cargo.toml)	1m 19s
lint:clippy (examples/bots/discord-bot/Cargo.toml)	1m 21s
lint:clippy (examples/bots/telegram-bot/Cargo.toml)	1m 18s
lint:clippy (examples/some-issuer/Cargo.toml)	1m 27s
lint:clippy (examples/some-verifier/Cargo.toml)	1m 26s
lint:clippy (examples/some-verifier-lib/Cargo.toml)	1m 6s
	15m 17s

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