Allow setting changes-file to an empty string

If it's set to an empty string, the action will not look for a changelog.

.github/workflows/test-no-changes-file.yml

@@ -0,0 +1,46 @@
+name: Test working-directory Parameter
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    name: Test no changes file
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Copy test project to root
+        shell: bash
+        run: |
+          cp -a test-project/* .
+          rm -fr test-project
+      - name: Build binary
+        uses: houseabsolute/actions-rust-cross@v0
+        with:
+          command: build
+          args: "--release"
+          target: x86_64-unknown-linux-musl
+          GITHUB_TOKEN: ${{ github.token }}
+      - name: Release
+        id: release
+        uses: ./
+        with:
+          executable-name: test-project
+          target: x86_64-unknown-linux-musl
+          changes-file: ""
+          # We don't want to actually do a release when running tests.
+          release-tag-prefix: "do-not-release"
+      - name: Install psutils on Windows
+        run: choco install --ignore-checksums psutils
+        if: runner.os == 'Windows'
+      - name: Check release artifacts
+        shell: bash
+        run: |
+          ./tests/check-release.pl \
+              --artifact-id "${{ steps.release.outputs.artifact-id }}" \
+              --executable-name test-project \
+              --github-token "${{ github.token }}" \
+              --repo houseabsolute/actions-rust-release \
+              --target "x86_64-unknown-linux-musl"

README.md

@@ -118,6 +118,8 @@ this case.
 The name of the file that contains the changelog for this project. This will be used to generate a
 description for the GitHub Release.
 
+If you set this to an empty string, then no changelog file will be included.
+
 ### `working-directory`
 
 - **Required**: no

make-archive.pl

@@ -83,7 +83,7 @@ sub main {
     }
 
     my $td = tempdir( CLEANUP => 1 );
-    for my $file (@files) {
+    for my $file ( grep {length} @files ) {
         copy( $file => $td )
             or die "Cannot copy $file => $td: $!";
     }

tests/check-release.pl

@@ -24,13 +24,15 @@ sub main {
     my $github_token;
     my $repo;
     my $target;
+    my $changes_file = 1;
 
     GetOptions(
         'artifact-id=s'     => \$artifact_id,
         'executable-name=s' => \$executable_name,
         'github-token=s'    => \$github_token,
         'repo=s'            => \$repo,
         'target=s'          => \$target,
+        'changes-file!'     => \$changes_file,
     );
 
     # We want to run this in a clean dir to avoid any conflicts with files in the current dir, like
@@ -82,7 +84,12 @@ sub main {
             system( 'tar', 'xzf', $archive_file );
         }
 
-        for my $file ( $executable_name, qw( README.md Changes.md ) ) {
+        my @expect_files = 'README.md';
+        if ($changes_file) {
+            push @expect_files, 'Changes.md';
+        }
+
+        for my $file ( $executable_name, @expect_files ) {
             ok( -f $file, "$file exists after unpacking archive" );
         }