Add builds on clang-10 and gcc-10 to github actions (#226)

Author: etr

.github/workflows/verify-build.yml

@@ -143,6 +143,15 @@ jobs:
             cc-compiler: g++-9
             debug: nodebug
             coverage: nocoverage
+          - test-group: extra
+            os: ubuntu-latest
+            os-type: ubuntu
+            build-type: none
+            compiler-family: gcc
+            c-compiler: gcc-10
+            cc-compiler: g++-10
+            debug: nodebug
+            coverage: nocoverage
           - test-group: extra
             os: ubuntu-18.04
             os-type: ubuntu
@@ -206,6 +215,15 @@ jobs:
             cc-compiler: clang++-9
             debug: nodebug
             coverage: nocoverage
+          - test-group: extra
+            os: ubuntu-latest
+            os-type: ubuntu
+            build-type: none
+            compiler-family: clang
+            c-compiler: clang-10
+            cc-compiler: clang++-10
+            debug: nodebug
+            coverage: nocoverage
           - test-group: extra
             os: ubuntu-latest
             os-type: ubuntu