dockerimg: add emoji fonts to base image

Add emoji font packages to the Docker base image to support
emoji rendering in browser screenshots:

- fonts-noto-color-emoji: Color emoji font from Google
- fonts-symbola: Symbolic font with Unicode 9.0 emoji characters
- fc-cache -f -v: Force font cache refresh

This follows the typical Ubuntu emoji font installation pattern:
apt-get install -y fonts-noto-color-emoji && fc-cache -f -v

Co-Authored-By: sketch <hello@sketch.dev>
Change-ID: sea5a1179c771a14bk
diff --git a/dockerimg/Dockerfile.base b/dockerimg/Dockerfile.base
index 73fecda..f9e1ae8 100644
--- a/dockerimg/Dockerfile.base
+++ b/dockerimg/Dockerfile.base
@@ -25,7 +25,9 @@
 		ca-certificates wget \
 		git jq sqlite3 npm nodejs gh ripgrep fzf python3 curl vim lsof iproute2 less \
 		libglib2.0-0 libnss3 libx11-6 libxcomposite1 libxdamage1 \
-		libxext6 libxi6 libxrandr2 libgbm1 libgtk-3-0 && \
+		libxext6 libxi6 libxrandr2 libgbm1 libgtk-3-0 \
+		fonts-noto-color-emoji fonts-symbola && \
+	fc-cache -f -v && \
 	apt-get clean && \
 	rm -rf /var/lib/apt/lists/* && \
 	rm -rf /usr/share/{doc,doc-base,info,lintian,man,groff,locale,zoneinfo}/*