Update .gitlab-ci.yml

.gitlab-ci.yml

-# Build Icecast
-build:
+# Build Opusfile with GCC
+build-gcc:
   tags:
     - alpine
     - docker
@@ -18,3 +18,22 @@ build:
     - make
     - make distcheck
 
+# Build Opusfile with clang
+build-clang:
+  tags:
+    - alpine
+    - docker
+
+  stage: build
+
+  before_script:
+  - apk update
+  - apk add musl-dev git make clang automake autoconf libtool gzip zip
+  - apk add openssl-dev libogg-dev opus-dev
+
+  script: 
+    # compile
+    - ./autogen.sh
+    - ./configure
+    - make
+    - make distcheck