add health check to dockerfile

Author: eiman-eltigani-ttd

tools/hashing-tool/Dockerfile

@@ -11,13 +11,18 @@ COPY app.css /usr/share/nginx/html/app.css
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
-# Configure nginx to serve on port 3071
+# Configure nginx to serve on port 3071 with healthcheck
 RUN echo 'server { \
     listen 3071; \
     location / { \
         root /usr/share/nginx/html; \
         index index.html; \
     } \
+    location = /ops/healthcheck { \
+        access_log off; \
+        return 200 "OK"; \
+        add_header Content-Type text/plain; \
+    } \
 }' > /etc/nginx/conf.d/default.conf
 
 EXPOSE 3071