Merge branch 'release-0.3.0' into 'main'

.docker/Dockerfile

.docker/cert.sh

.docker/linkahead-client.json

.docker/tester.yml

.gitignore

.gitlab-ci.yml

.gitlab/merge_request_templates/Default.md

CHANGELOG.md

CMakeLists.txt

CMakeUserPresets.json

Makefile

README.md

conanfile.txt

make.ps1

test/CMakeLists.txt

test/linkahead_test_utility.h

test/test_async.cpp

test/test_ccaosdb.cpp

test/test_clinkahead.cpp

test/test_connection.cpp