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/testdata/testcreatedockerfile_empty_repo.dockerfile b/dockerimg/testdata/testcreatedockerfile_empty_repo.dockerfile
index 303b5c3..25dad40 100644
--- a/dockerimg/testdata/testcreatedockerfile_empty_repo.dockerfile
+++ b/dockerimg/testdata/testcreatedockerfile_empty_repo.dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/boldsoftware/sketch:a73fec46b81f26cba546a2f4c44ff381
+FROM ghcr.io/boldsoftware/sketch:8a0fa60d74a8342c828aaec2c6d25bf3
 
 ARG GIT_USER_EMAIL
 ARG GIT_USER_NAME
@@ -7,7 +7,7 @@
     git config --global user.name "$GIT_USER_NAME" && \
     git config --global http.postBuffer 524288000
 
-LABEL sketch_context="9e6f89a8e401b079da53432e57e9d9d8bf3e4241e9ff65ce06c6795939432d3f"
+LABEL sketch_context="12fa8cf256936d95e87604d85897168f0244bf1cc5b24f011c39f7b1ddce2786"
 COPY . /app
 RUN rm -f /app/tmp-sketch-dockerfile
 
@@ -17,7 +17,7 @@
 # Switch to lenient shell so we are more likely to get past failing extra_cmds.
 SHELL ["/bin/bash", "-uo", "pipefail", "-c"]
 
-
+RUN go mod tidy || true
 
 # Switch back to strict shell after extra_cmds.
 SHELL ["/bin/bash", "-euxo", "pipefail", "-c"]