fix wrong syntax

.github/workflows/reusable-app-prod.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        ref: ${{ input.checkout-ref }}
+        ref: ${{ inputs.checkout-ref }}
 
     - uses: actions/setup-node@v2
       with:
@@ -104,7 +104,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        ref: ${{ input.checkout-ref }}
+        ref: ${{ inputs.checkout-ref }}
 
     - uses: actions/setup-node@v2
       with:
@@ -196,7 +196,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        ref: ${{ input.checkout-ref }}
+        ref: ${{ inputs.checkout-ref }}
 
     - uses: actions/setup-node@v2
       with:
@@ -285,7 +285,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        ref: ${{ input.checkout-ref }}
+        ref: ${{ inputs.checkout-ref }}
         fetch-depth: 0
 
     - uses: actions/setup-node@v2