Use a pinned hash for the base Docker image and bump to the latest version of Alpine

Author: IsaacG

Dockerfile

@@ -1,8 +1,7 @@
-FROM alpine:3.18
+FROM alpine:3.23.4@sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11
 
 RUN apk add --no-cache bash jq python3 py3-pip
-RUN pip3 install --upgrade pip
-RUN pip3 install pygments
+RUN pip3 install --break-system-packages --upgrade pip & pip3 install --break-system-packages pygments
 
 WORKDIR /opt/representer
 COPY . .