add shell script syntax check to tests #36

Job	Run time
Functional tests	5s
Build for openwrt-24.10 / aarch64_cortex-a53	4m 19s
Build for openwrt-24.10 / x86_64	3m 57s
Build for openwrt-25.12 / aarch64_cortex-a53	4m 34s
Build for openwrt-25.12 / arm_cortex-a9	3m 46s
Build for openwrt-24.10 / mips_24kc	4m 6s
Build for openwrt-24.10 / arm_cortex-a9	4m 18s
Build for openwrt-25.12 / arm_cortex-a7	3m 44s
Build for openwrt-24.10 / aarch64_generic	4m 57s
Build for openwrt-25.12 / mipsel_24kc	3m 44s
Build for openwrt-25.12 / x86_64	3m 40s
Build for openwrt-24.10 / mipsel_24kc	4m 14s
Build for openwrt-25.12 / aarch64_generic	4m 15s
Build for openwrt-25.12 / mips_24kc	3m 44s
Build for openwrt-24.10 / arm_cortex-a7	3m 59s
Release mossdef-org/https-dns-proxy	10s
	57m 32s

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