Add flag skip-existing to skip upload if release exists (#134)

* add skip-existing option

Signed-off-by: Alexandre Nicolaie dit Clairville <alexandre.nicolaie@gmail.com>

---------

Signed-off-by: Alexandre Nicolaie dit Clairville <alexandre.nicolaie@gmail.com>
Signed-off-by: Alexandre NICOLAIE <xunleii@users.noreply.github.com>
Co-authored-by: Carlos Tadeu Panato Junior <ctadeu@gmail.com>

action.yml

@@ -23,7 +23,10 @@ inputs:
     description: "Just install cr tool"
     required: false
   skip_packaging:
-    description: "skip the packaging option (do your custom packaging before running this action"
+    description: "Skip the packaging option (do your custom packaging before running this action)"
+    required: false
+  skip_existing:
+    description: "Skip package upload if release exists"
     required: false
   mark_as_latest:
     description: Mark the created GitHub release as 'latest'
@@ -65,6 +68,10 @@ runs:
             args+=(--skip-packaging "${{ inputs.skip_packaging }}")
         fi
 
+        if [[ -n "${{ inputs.skip_existing }}" ]]; then
+            args+=(--skip-existing "${{ inputs.skip_existing }}")
+        fi
+
         if [[ -n "${{ inputs.mark_as_latest }}" ]]; then
             args+=(--mark-as-latest "${{ inputs.mark_as_latest }}")
         fi