Keep cabal.project from git when building the main branch

Author: tarleb

alpine/Dockerfile

@@ -31,8 +31,9 @@ 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.
-RUN rm -f cabal.project
+# 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

@@ -24,8 +24,9 @@ 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.
-RUN rm -f cabal.project
+# 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

@@ -35,8 +35,9 @@ 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.
-RUN rm -f cabal.project
+# 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