Merge pull request #6939 from zcash/fix_gitian_parallel #12

Job	Run time
Define CI matrix (Debian-bookworm, 1, Debian Bookworm, ubuntu-20.04-8cores, ubuntu-20.04, electri...	23s
RPC set up tier 1 platform Debian Bookworm	54s
Build tier 1 platform Debian Bookworm	1s
RPC set up tier 1 platform Debian bullseye	52s
Build tier 1 platform Debian bullseye	1s
RPC set up tier 1 platform Ubuntu 20.04	9s
Build tier 1 platform Ubuntu 20.04	1s
Build tier 3 platform Ubuntu 22.04	1s
Build tier 3 platform Windows (64-bit MinGW)	1s
Build tier 3 platform ARM64 Linux	1s
Boost.Test tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
Rust test tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
secp256k1 tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
GoogleTest tier ${{ matrix.tier }} platform ${{ matrix.platform }} - shard ${{ matrix.shard_index }}	0s
univalue tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
Bitrot check tier ${{ matrix.tier }} platform ${{ matrix.platform }} flag '${{ matrix.configure_flag }}'	0s
util-test tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
no-dot-so tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
sec-hard tier ${{ matrix.tier }} platform ${{ matrix.platform }}	0s
RPC tests tier ${{ matrix.tier }} platform ${{ matrix.platform }} ${{ matrix.shard }}	0s
	2m 24s

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