Remove superfluous commands in Dockerfiles

The `rm -f cabal.project` command had no effect as it ran in the wrong
directory. Furthermore, removing the file leads to cabal errors, so the
command is dropped instead of fixed.

Author: tarleb

alpine/Dockerfile

@@ -1,5 +1,5 @@
 # Base ##################################################################
-ARG base_image_version=3.16
+ARG base_image_version=3.20
 FROM alpine:$base_image_version AS alpine-builder-base
 WORKDIR /app
 
@@ -31,10 +31,6 @@ ARG pandoc_commit=main
 RUN git clone --branch=$pandoc_commit --depth=1 --quiet \
   https://github.com/jgm/pandoc /usr/src/pandoc
 
-# Remove the settings that ship with pandoc, unless we're building the main
-# branch.
-RUN [ "${pandoc_commit}" = "main" ] || rm -f cabal.project
-
 COPY ./alpine/freeze/pandoc-$pandoc_commit.project.freeze \
      /usr/src/pandoc/cabal.project.freeze
 

static/Dockerfile

@@ -1,7 +1,6 @@
 # Builder
-ARG base_image_version=3.14
+ARG base_image_version=3.20
 FROM alpine:$base_image_version AS static-builder-base
-WORKDIR /app
 
 RUN apk --no-cache add \
         alpine-sdk \
@@ -24,10 +23,6 @@ ARG pandoc_commit=main
 RUN git clone --branch=$pandoc_commit --depth=1 --quiet \
   https://github.com/jgm/pandoc /usr/src/pandoc
 
-# Remove the settings that ship with pandoc, unless we're building the main
-# branch.
-RUN [ "${pandoc_commit}" = "main" ] || rm -f cabal.project
-
 COPY ./static/freeze/pandoc-$pandoc_commit.project.freeze \
      /usr/src/pandoc/cabal.project.freeze
 

ubuntu/Dockerfile

@@ -1,12 +1,7 @@
 # Base ##################################################################
 ARG base_image_version=noble
 FROM ubuntu:$base_image_version AS ubuntu-builder-base
-WORKDIR /app
 
-## An ARG instruction goes out of scope at the end of the build stage 
-## where it was defined. To use an argument in multiple stages, each stage 
-## must include the ARG instruction
-ARG base_image_version=noble
 ARG lua_version=5.4
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get -q --no-allow-insecure-repositories update \
@@ -35,10 +30,6 @@ ARG pandoc_commit=main
 RUN git clone --branch=$pandoc_commit --depth=1 --quiet \
   https://github.com/jgm/pandoc /usr/src/pandoc
 
-# Remove the settings that ship with pandoc, unless we're building the main
-# branch.
-RUN [ "${pandoc_commit}" = "main" ] || rm -f cabal.project
-
 COPY ./ubuntu/freeze/pandoc-$pandoc_commit.project.freeze \
      /usr/src/pandoc/cabal.project.freeze