Add missing zstd-libs to final Docker image

Also add `minetestserver --version` command to verify docker build in CI

.github/workflows/build.yml

@@ -180,7 +180,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Build docker image
         run: |
-          docker build .
+          docker build . -t minetest:latest
+          docker run --rm minetest:latest /usr/local/bin/minetestserver --version
 
   win32:
     name: "MinGW cross-compiler (32-bit)"

Dockerfile

@@ -57,7 +57,7 @@ RUN mkdir build && \
 ARG DOCKER_IMAGE=alpine:3.14
 FROM $DOCKER_IMAGE AS runtime
 
-RUN apk add --no-cache sqlite-libs curl gmp libstdc++ libgcc libpq luajit jsoncpp && \
+RUN apk add --no-cache sqlite-libs curl gmp libstdc++ libgcc libpq luajit jsoncpp zstd-libs && \
 	adduser -D minetest --uid 30000 -h /var/lib/minetest && \
 	chown -R minetest:minetest /var/lib/minetest