Update Speedtest CLI installation method in Dockerfile (#2247)

Co-authored-by: Alex Justesen <[email protected]>

Author: alexjustesen

docker/8.3/Dockerfile

@@ -6,6 +6,7 @@ ARG WWWGROUP
 ARG NODE_VERSION=22
 ARG MYSQL_CLIENT="mysql-client"
 ARG POSTGRES_VERSION=17
+ARG SPEEDTEST_VERSION=1.2.0
 
 WORKDIR /var/www/html
 
@@ -45,8 +46,9 @@ RUN apt-get update && apt-get upgrade -y \
     && apt-get update \
     && apt-get install -y $MYSQL_CLIENT \
     && apt-get install -y postgresql-client-$POSTGRES_VERSION \
-    && curl -s https://packagecloud.io/install/repositories/ookla/speedtest-cli/script.deb.sh | bash \
-    && apt-get install -y speedtest-cli \
+    && curl -o /tmp/speedtest-cli.tgz -L \
+        "https://install.speedtest.net/app/cli/ookla-speedtest-$SPEEDTEST_VERSION-linux-x86_64.tgz" \
+    && tar -xzf /tmp/speedtest-cli.tgz -C /usr/bin \
     && apt-get -y autoremove \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*