Fix up build by using apt-get instead of apt
diff --git a/Dockerfile b/Dockerfile
index 1b8b3f0..83d9acc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -45,8 +45,8 @@
# Build basic Pelican image
FROM python:${PYTHON_VERSION}-slim-buster AS pelican-asf
-RUN apt update && apt upgrade -y
-RUN apt install curl cmake build-essential -y
+RUN apt-get update && apt-get upgrade -y
+RUN apt-get install curl cmake build-essential -y
# Copy the current ASF code
WORKDIR /tmp/pelican-asf
@@ -62,14 +62,14 @@
FROM python:${PYTHON_VERSION}-slim-buster
-RUN apt update && apt upgrade -y
+RUN apt-get update && apt-get upgrade -y
# git is used by `buildsite.py git`
-RUN apt install git -y
+RUN apt-get install git -y
# subversion is used by asfdata.py plugin in template-site to retrieve release information
# wget is used by pagefind.sh (www-site)
-RUN apt install subversion wget -y
+RUN apt-get install subversion wget -y
# we likely do not need the following
-# RUN apt install unzip fontconfig -y
+# RUN apt-get install unzip fontconfig -y
# Use the Pelican version as installed on CI pelican builders (2023-06-02)
ARG PELICAN_VERSION=4.5.4