Fixes source build for alpine (#341)

For postgres 15.3 build failed.
Added clang15 and llvm15-dev to fix the issue
Reference:
docker-library/postgres@a3b0bb6#diff-263e4d92e2bddc6bbd3c9031218d17dfb38bd68d9e94f05d0604c41207944d98R47

Author: Gürkan İndibay

alpine/Dockerfile

@@ -20,8 +20,9 @@ RUN apk add --no-cache \
         curl-dev \
         openssl-dev \
         ca-certificates \
-        clang \
         llvm \
+        llvm15-dev \
+        clang15 \
         lz4-dev \
         zstd-dev \
         libxslt-dev \