Add ccls language server

From https://github.com/MaskRay/ccls

.github/workflows/build-image.yml

@@ -18,6 +18,9 @@ jobs:
           - context: bashls
             tag: bash-language-server
 
+          - context: ccls
+            tag: ccls
+
           - context: clangd
             tag: clangd-language-server
 

docker-compose.yaml

@@ -6,6 +6,11 @@ services:
     build:
       context: servers/bashls
 
+  ccls:
+    image: lspcontainers/ccls
+    build:
+      context: servers/ccls
+
   clangd:
     image: lspcontainers/clangd-language-server
     build:

servers/ccls/Dockerfile

@@ -0,0 +1,20 @@
+FROM alpine as builder
+
+RUN apk add --no-cache clang17-dev clang17-static llvm17-dev llvm17-static llvm17-gtest cmake make git
+RUN git clone --depth=1 --recursive https://github.com/MaskRay/ccls /ccls
+
+WORKDIR /ccls
+
+RUN cmake -H. -BRelease -DCMAKE_BUILD_TYPE=Release \
+                        -DCMAKE_CXX_COMPILER=/usr/bin/clang++-17 \
+                        -DCMAKE_PREFIX_PATH=/usr/lib/llvm17
+RUN cmake --build Release
+RUN cmake --build Release --target install
+
+FROM alpine
+
+RUN apk add --no-cache clang17
+
+COPY --from=builder /usr/local/bin/ccls /usr/local/bin/ccls
+
+CMD ["/usr/local/bin/ccls"]