Try and debug the new job

.github/workflows/dev.yml

@@ -232,6 +232,9 @@ jobs:
           maint/RunPerlTest
 
   chaffinch:
+    # Job to verify that the CMake "unity" build (single-file / jumbo build) passes.
+    # If this fails, it's usually because two different files define some file-static
+    # functions or macros which collide.
     name: CMake unity build
     runs-on: ubuntu-latest
     steps:
@@ -250,8 +253,11 @@ jobs:
         run: cd build && ctest -j3 --output-on-failure
 
   heron:
+    # Job to verify that the tasks performed by PrepareRelease have been done. It is
+    # the committer's responsibility (currently) to run PrepareRelease themselves when
+    # making a PR, so that everything is kept in-sync.
     name: Check for PrepareRelease cleanliness
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -263,4 +269,25 @@ jobs:
 
       - name: Working directory clean
         run:  |
+          set +e
+          # XXX DEBUG
+          git status --porcelain
+          echo "STATUS: $?"
+
+          echo "DIFF"
+          git diff
+
+          echo "ENV"
+          env | sort
+
+          echo "lsb_release"
+          lsb_release -a
+          nroff --version
+
+          echo "locale"
+          locale -a
+          locale
+          # XXX DEBUG
+
           [ -z "`git status --porcelain`" ]
+          echo "STATUS 2: $?"

maint/PrepareRelease

@@ -93,12 +93,16 @@ done
 
 # Make pcre2demo.3 from the pcre2demo.c source file
 
+# XXX
+echo "FIRST DATE"
+git log -n1 --date=format:"%d %B %Y" --format=%cd ../src/pcre2demo.c
+
 echo "Making pcre2demo.3"
 perl <<"END" >pcre2demo.3
   use Time::Piece;
   open(VH, "<", "../src/config.h.generic") || die "Failed to open src/config.h.generic\n";
-  open(IN, "../src/pcre2demo.c") || die "Failed to open src/pcre2demo.c\n";
-  open(OUT, ">pcre2demo.3") || die "Failed to open pcre2demo.3\n";
+  open(IN, "<", "../src/pcre2demo.c") || die "Failed to open src/pcre2demo.c\n";
+  open(OUT, ">", "pcre2demo.3") || die "Failed to open pcre2demo.3\n";
   my $version;
   while (<VH>)
   {
@@ -146,6 +150,10 @@ perl <<"END" >pcre2demo.3
 END
 if [ $? != 0 ] ; then exit 1; fi
 
+# XXX
+echo "SECOND DATE"
+git log -n1 --date=format:"%d %B %Y" --format=%cd ../src/pcre2demo.c
+
 
 # Make HTML form of the documentation.