Install runtime dependencies

run-x86_64-linux.dockerfile

@@ -1,5 +1,11 @@
 FROM ubuntu:bionic-20180821
 
+ENV \
+    #
+    # The 'tzdata' APT package waits for user input on install by default
+    # https://stackoverflow.com/questions/44331836/apt-get-install-tzdata-noninteractive
+    DEBIAN_FRONTEND=noninteractive
+
 RUN \
     apt-get update -q && \
     apt-get install -qy --no-install-recommends \
@@ -14,4 +20,8 @@ RUN \
         virtualenv \
         #
         # Fetching build artifacts
-        curl
+        curl \
+        #
+        # Servo’s runtime dependencies
+        libgstreamer-plugins-bad1.0 \
+        libssl1.0.0