rcc

ci: Add `mariadb_config` to `$PATH` on macOS #2116

Job	Run time
Smoke test: stock R	4m 5s
Check matrix	4s
Without DBItest	3m 8s
Without decor	3m 22s
rcc: macos-latest (4.4)	3m 8s
Without readr	3m 44s
rcc: macos-latest (4.3)	2m 34s
rcc: windows-latest (devel)	6m 27s
rcc: windows-latest (4.4)	6m 32s
rcc: windows-latest (4.3)	9m 3s
rcc: ubuntu-22.04 (devel)	3m 3s
rcc: ubuntu-22.04 (4.4)	2m 52s
rcc: ubuntu-22.04 (4.3)	2m 56s
rcc: ubuntu-22.04 (4.2)	3m 30s
rcc: ubuntu-22.04 (4.1)	3m 2s
rcc: ubuntu-22.04 (4.0)	3m 21s
rcc: ubuntu-22.04 (4.4) with covr	3m 22s
rcc: macos-latest (release) mariadb_config	2m 49s
rcc: macos-latest (release) mysql_config	2m 21s
rcc: ubuntu-22.04 (release) MySQL server	2m 47s
rcc: ubuntu-22.04 (release) MariaDB server, MySQL client	2m 45s
rcc: ubuntu-22.04 (release) MySQL server, MariaDB client	3m 0s
rcc: ubuntu-22.04 (release) MariaDB server + client	3m 0s
	1h 20m 55s

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