Build: Unify custom dockerfiles, fix missing semicolon (#59615)

* unify custom dockerfiles, fix missing semicolon

* tweak verbiage

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

* update example description

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

packaging/docker/custom/Dockerfile

@@ -2,23 +2,35 @@ ARG GRAFANA_VERSION="latest"
 
 FROM grafana/grafana:${GRAFANA_VERSION}
 
-USER root
-
 ARG GF_INSTALL_IMAGE_RENDERER_PLUGIN="false"
 
 ARG GF_GID="0"
+
 ENV GF_PATHS_PLUGINS="/var/lib/grafana-plugins"
+ENV GF_PLUGIN_RENDERING_CHROME_BIN="/usr/bin/chrome"
+
+USER root
 
 RUN mkdir -p "$GF_PATHS_PLUGINS" && \
     chown -R grafana:${GF_GID} "$GF_PATHS_PLUGINS" && \
     if [ $GF_INSTALL_IMAGE_RENDERER_PLUGIN = "true" ]; then \
-      apk add --no-cache udev ttf-opensans chromium \
+      if grep -i -q alpine /etc/issue; then \
+        apk add --no-cache udev ttf-opensans chromium && \
+        ln -s /usr/bin/chromium-browser "$GF_PLUGIN_RENDERING_CHROME_BIN"; \
+      else \
+        cd /tmp && \
+        curl -sLO https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb && \
+        DEBIAN_FRONTEND=noninteractive && \
+        apt-get update -q && \
+        apt-get install -q -y ./google-chrome-stable_current_amd64.deb && \
+        rm -rf /var/lib/apt/lists/* && \
+        rm ./google-chrome-stable_current_amd64.deb && \
+        ln -s /usr/bin/google-chrome "$GF_PLUGIN_RENDERING_CHROME_BIN"; \
+      fi \
     fi
 
 USER grafana
 
-ENV GF_PLUGIN_RENDERING_CHROME_BIN="/usr/bin/chromium-browser"
-
 RUN if [ $GF_INSTALL_IMAGE_RENDERER_PLUGIN = "true" ]; then \
       grafana-cli \
         --pluginsDir "$GF_PATHS_PLUGINS" \