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Add pkg-config to the debian based builders
Add newer gcc to opensuse 15.3
Include newer gcc versions on older rpm distros
Disable DST Root certificate in SLES12 sp2
Update golang to 1.16.7
Use RMT instead of SMT for SLES builds
Use buildx for armv6 builds to build RPi packages on AWS Graviton
Add openssl binary to CentOS-7
Update provisioner image to be used for the reference architecture testing