docker: Add gfortran support #4170

Job	Run time
cargo-deny	22s
check	35s
clippy (macos-latest)	59s
fmt	9s
clippy (ubuntu-latest)	23s
generate-matrix	18s
clippy (windows-latest)	44s
shellcheck	8s
test (macos-latest)	1m 34s
test (ubuntu-latest)	1m 10s
test (windows-latest)	2m 45s
bisect	3m 37s
remote	2m 37s
target (${{ matrix.pretty }},${{ matrix.os }})	0s
docker-in-docker	4m 0s
foreign	2m 33s
podman	1m 59s
publish	0s
conclusion	1s
Coverage	9s
	24m 3s

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