Handle case when triggered event is a manual workflow_dispatch (#97)

Co-authored-by: Saketh Somaraju <[email protected]>

action.yaml

@@ -315,13 +315,14 @@ runs:
 
         DBT_DEPLOY=false
 
-        # case when the triggered event is a new branch or tag creation, we would need to deploy the dbt project because we cannot determine that it does not need to be deployed
-        if [[ "${{ github.event.before }}" == "0000000000000000000000000000000000000000" ]]
-        then
-          DBT_DEPLOY=true
-          files=()
+        # case when the triggered event is a manual workflow dispatch or a new branch or tag creation, we would need to deploy the dbt project because we cannot determine that it does not need to be deployed
+        GITHUB_EVENT_BEFORE=${{ github.event.before }}
+        GITHUB_EVENT_AFTER=${{ github.event.after }}
+        if [[ "$GITHUB_EVENT_BEFORE" == "0000000000000000000000000000000000000000" || -z $GITHUB_EVENT_BEFORE && -z $GITHUB_EVENT_AFTER ]]; then
+            DBT_DEPLOY=true
+            files=()
         else
-          files=$(git diff --name-only ${{ github.event.before }} ${{ github.event.after }})
+          files=$(git diff --name-only $GITHUB_EVENT_BEFORE $GITHUB_EVENT_AFTER)
           echo "files changed: $files"
         fi
 
@@ -368,14 +369,15 @@ runs:
         DAGS_ONLY_DEPLOY=false
         SKIP_IMAGE_OR_DAGS_DEPLOY=true
 
-        # case when the triggered event is a new branch or tag creation, we would need to deploy the image because we cannot determine that it does not need to be deployed
-        if [[ "${{ github.event.before }}" == "0000000000000000000000000000000000000000" ]]
-        then
-          DAGS_ONLY_DEPLOY=false
-          SKIP_IMAGE_OR_DAGS_DEPLOY=false
-          files=()
+        # case when the triggered event is a manual workflow dispatch or a new branch or tag creation, we would need to deploy the image because we cannot determine that it does not need to be deployed
+        GITHUB_EVENT_BEFORE=${{ github.event.before }}
+        GITHUB_EVENT_AFTER=${{ github.event.after }}
+        if [[ "$GITHUB_EVENT_BEFORE" == "0000000000000000000000000000000000000000" ||  -z $GITHUB_EVENT_BEFORE && -z $GITHUB_EVENT_AFTER ]]; then
+            DAGS_ONLY_DEPLOY=false
+            SKIP_IMAGE_OR_DAGS_DEPLOY=false
+            files=()
         else
-          files=$(git diff --name-only ${{ github.event.before }} ${{ github.event.after }})
+          files=$(git diff --name-only $GITHUB_EVENT_BEFORE $GITHUB_EVENT_AFTER)
           echo "files changed: $files"
         fi