.github/workflows/main.yml:
Do a 'make check' for matrix builds.
Move documentation into separate job to reduce matrix build times
Add in CMake job.
Add in distribution job.
Add in tinydtls job.
Add in contiki/lwip job.
scripts/github_dist.sh:
Do the distribution checks using a script.
examples/etsi_iot_01.c:
examples/tiny.c:
Fix include coap.h directory in old examples.
README.md:
Update status badges to get only the branch actions and remove CMake
status badge.
