Added more docker servers as reference

Former-commit-id: aa9fbe9082

Docker/servers/bashls/Dockerfile

@@ -0,0 +1,17 @@
+FROM alpine:3.22.1
+
+ARG VERSION=5.6.0
+LABEL version="${VERSION}"
+
+# using npm breaks shellcheck download of its binary from api.github.com
+# running shellcheck -V forces it to download its binary during build
+RUN apk add --no-cache \
+  nodejs=22.16.0-r2 \
+  shellcheck=0.10.0-r2 \
+  yarn=1.22.22-r1 \
+  && yarn global add \
+    shellcheck@3.1.0 \
+    bash-language-server@${VERSION} \
+  && shellcheck -V
+
+CMD [ "bash-language-server", "start" ]