Add dry-run option

Author: mayeut

action.yml

@@ -30,6 +30,10 @@ inputs:
     description: Show verbose output.
     required: false
     default: false
+  dry_run:
+    description: Do not actually upload the packages.
+    required: false
+    default: false
 branding:
   color: yellow
   icon: upload-cloud
@@ -44,3 +48,4 @@ runs:
   - ${{ inputs.verify_metadata }}
   - ${{ inputs.skip_existing }}
   - ${{ inputs.verbose }}
+  - ${{ inputs.dry_run }}

twine-upload.sh

@@ -2,7 +2,7 @@
 set -Eeuo pipefail
 
 
-if [[
+if [[ ${INPUT_DRY_RUN,,} != "true" ]] && [[
     "$INPUT_USER" == "__token__" &&
     ! "$INPUT_PASSWORD" =~ ^pypi-
   ]]
@@ -35,6 +35,10 @@ if [[ ${INPUT_VERIFY_METADATA,,} != "false" ]] ; then
     twine check ${INPUT_PACKAGES_DIR%%/}/*
 fi
 
+if [[ ${INPUT_DRY_RUN,,} != "false" ]] ; then
+    exit 0
+fi
+
 TWINE_EXTRA_ARGS=
 if [[ ${INPUT_SKIP_EXISTING,,} != "false" ]] ; then
     TWINE_EXTRA_ARGS=--skip-existing