fix(flutter): Flutter builder caching being broken - part 2 (#319)

* fix(cat-ci): Flutter broken CI cache

* fix(cat-ci): spelling

* fix(cat-ci): really fix the spelling

* fix(cat-ci): Make a test for building flutter-base in cat-ci.

* style(cat-ci): dedent the run lines for google chrome

* fix(cat-ci): env var definition and spelling

earthly/flutter/Earthfile

@@ -1,5 +1,7 @@
 VERSION 0.8
 
+# cspell: words noninteractive
+
 IMPORT ./installer AS installer
 
 # flutter-src save Flutter source code as artifact.
@@ -21,6 +23,8 @@ flutter-src:
 flutter-base:
     FROM debian:bookworm-20240513-slim
 
+    ENV DEBIAN_FRONTEND=noninteractive
+
     RUN apt-get update --fix-missing
     RUN apt-get install -y apt-utils git curl gzip unzip bzip2 bash jq gpg lcov
 
@@ -49,6 +53,10 @@ flutter-base:
 flutter-base-all-hosts:
     BUILD --platform=linux/amd64 --platform=linux/arm64 +flutter-base
 
+# Test that we can actually build the flutter base image.
+build-flutter-base:
+    FROM +flutter-base
+
 SETUP:
     FUNCTION
     FROM +flutter-base

earthly/flutter/installer/Earthfile

@@ -37,14 +37,14 @@ INSTALL_CHROME_LINUX64:
             && dpkg -i /opt/chrome/chrome_amd64/*.deb || true \
             && rm -rf /opt/chrome.zip /opt/chrome \
             && mv /usr/bin/google-chrome-stable /usr/bin/google-chrome
-            RUN google-chrome --version
+        RUN google-chrome --version
 
         RUN printf "${BLUE} Installing Chromedriver..." \
             && mkdir -p /opt/chromedriver \
             && curl -L "${BASE_URL}/chrome/chromedriver-linux64.zip" \
             -o /opt/chromedriver/chromedriver.zip \
             && unzip -j /opt/chromedriver/chromedriver.zip -d /usr/local/bin/
-            RUN chromedriver --version
+        RUN chromedriver --version
 
     ELSE
         DO +INSTALL_CHROMIUM --PACKAGE_TYPE="chromium" --DOWNLOAD_URL="${BASE_URL}/chrome/chromium.zip"