fix: allow the output of the action to be multiline (#146)

Co-authored-by: kvanzuijlen <kvanzuijlen@users.noreply.github.com>

Author: kvanzuijlen

action.yml

@@ -1,18 +1,18 @@
-name: 'Version'
-description: 'A tool to handle version numbers'
+name: "Version"
+description: "A tool to handle version numbers"
 inputs:
   version:
-    description: 'Explicit version to use (e.g. v0.1.5). Defaults to the action tag.'
+    description: "Explicit version to use (e.g. v0.1.5). Defaults to the action tag."
     required: false
   command:
-    description: 'Command to run (bump or latest)'
+    description: "Command to run (bump or latest)"
     required: true
   args:
-    description: 'Arguments to pass to the command'
+    description: "Arguments to pass to the command"
     required: true
 outputs:
   version:
-    description: 'The output of the command'
+    description: "The output of the command"
     value: ${{ steps.version-cli.outputs.version }}
 runs:
   using: "composite"
@@ -26,7 +26,7 @@ runs:
       run: |
         # If input is empty, fall back to the action's pinned tag (e.g., v0.1.5)
         VERSION="${INPUT_VERSION:-$ACTION_REF}"
-        
+
         if [[ "$VERSION" =~ ^[0-9a-f]{40}$ ]]; then
           echo "::error::When pinning by SHA, you must explicitly provide the 'version' input."
           echo "Please update your workflow:"
@@ -35,12 +35,12 @@ runs:
           echo "      version: v0.1.5 # <--- Required"
           exit 1
         fi
-        
+
         if [ -z "$VERSION" ]; then
           echo "Error: Could not determine version. Please pin the action or provide a version input."
           exit 1
         fi
-        
+
         echo "Resolved version: $VERSION"
 
         # --- 2. MAP OS & ARCH ---
@@ -66,14 +66,14 @@ runs:
         # --- 3. CONSTRUCT URL ---
         FILENAME="version_${OS_TYPE}_${ARCH_TYPE}.tar.gz"
         URL="https://github.com/version-cli/version/releases/download/${VERSION}/${FILENAME}"
-        
+
         echo "Downloading from: $URL"
 
         # --- 4. DOWNLOAD & INSTALL ---
         curl -sLf -H "Authorization: Bearer $GITHUB_TOKEN" "$URL" -o "version.tar.gz"
 
         mkdir -p "$HOME/.local/bin"
-        
+
         tar -xzf "version.tar.gz" -C "$HOME/.local/bin" "$BINARY_NAME"
 
         # --- 5. UPDATE PATH ---
@@ -87,5 +87,8 @@ runs:
         COMMAND: ${{ inputs.command }}
         ARGS: ${{ inputs.args }}
       run: |
-        OUTPUT=$(version "$COMMAND" $ARGS)
-        echo "version=$OUTPUT" >> $GITHUB_OUTPUT
+        {
+          echo "version<<EOF"
+          version "$COMMAND" $ARGS
+          echo "EOF"
+        } >> "$GITHUB_OUTPUT"