add ockam docker image #29957

Job	Run time
Rust - build	2m 47s
Rust - build_docs	1m 47s
Rust - build_examples	2m 57s
Rust - build_nightly	3m 28s
Rust - check_cargo_update	1m 56s
Rust - build_release	7m 53s
Rust - check_no_std	1m 39s
Rust - check_nightly	2m 27s
Rust - lint_cargo_readme	53s
Rust - lint_cargo_fmt_check	53s
Rust - ockam_command_cross_build (linux_armv7)	12m 56s
Rust - lint_cargo_clippy	3m 22s
Rust - ockam_command_cross_build (macos_silicon)	13m 0s
Rust - lint_cargo_deny	52s
Rust - test	12m 58s
Rust - lint_cargo_toml_files	46s
Rust - test_nightly	13m 1s
Rust - test_ockam_command (linux_86)	7m 38s
Rust - test_postgres	6m 36s
Rust - lint_cargo_machete	52s
	1h 38m 41s

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