test with rocky linux instead of centos (#772)

.ci/docker-ci/rocky/Dockerfile

@@ -1,4 +1,4 @@
-FROM centos:8
+FROM rockylinux:8
 
 LABEL maintainer="mail@sobolevn.me"
 LABEL vendor="git-secret team"

.ci/release-ci/rocky/Dockerfile

@@ -1,4 +1,4 @@
-FROM centos:8
+FROM rockylinux:8
 
 LABEL maintainer="mail@sobolevn.me"
 LABEL vendor="git-secret team"

.github/workflows/test.yml

@@ -33,6 +33,7 @@ jobs:
           - ubuntu
           - alpine
           - fedora
+          - rocky
     steps:
     - uses: actions/checkout@v2
     - name: Run checks

CHANGELOG.md

@@ -21,6 +21,7 @@
 - Refactor docs: new pages, new content 
 - Upgrade bats-core to v1.5.0 (#755)
 - Update docs for use with CI/CD server (#675)
+- Test with RockyLinux instead of CentOS in Github Actions (#765)
 
 
 ## 0.4.0