Fix build issues with missing `rules_docker` loader binary #2912

Job	Run time
env-protect-setup	5s
authorize	4s
get-dev-image / get-image	5s
generate-matrix	2m 20s
clang-tidy	50s
code-coverage	-1s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	3m 4s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	3m 21s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	2m 21s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	5m 4s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	3m 21s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	3m 3s
build-and-test-status	2s
	23m 39s

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