fix a typo

.github/workflows/tests.yaml

@@ -577,7 +577,8 @@ jobs:
           # we need to pre-install the CLI to set the context
           curl -sSL https://install.astronomer.io | sudo bash -s
 
-          echo "test_start_time=$(date -u)" >> $GITHUB_OUTPUT
+          test_start_time=$(date -u +"%Y-%m-%dT%H:%M:%S.%NZ")
+          echo "test_start_time=$test_start_time" >> $GITHUB_OUTPUT
 
       - name: Set CLI context
         run: astro context switch ${{ steps.get-astro-env-info.outputs.astronomer_host }}
@@ -611,7 +612,8 @@ jobs:
           fi
 
           updated_at=$(date -u -d "${{ steps.get-dbt-bundle-info.outputs.updated_at }}" +"%s.%N")
-          if [[ $(echo "$updated_at > ${{ steps.setup.outputs.test_start_time }}" | bc -l) ]]; then
+          test_start_time=$(date -u -d "${{ steps.setup.outputs.test_start_time }}" +"%s.%N")
+          if [[ $(echo "$updated_at > $test_start_time" | bc -l) ]]; then
             echo "DBT Deploy Action validation succeeded: DBT bundle found"
             exit 0
           fi
@@ -657,7 +659,8 @@ jobs:
           # we need to pre-install the CLI to set the context
           curl -sSL https://install.astronomer.io | sudo bash -s
 
-          echo "test_start_time=$(date -u)" >> $GITHUB_OUTPUT
+          test_start_time=$(date -u +"%Y-%m-%dT%H:%M:%S.%NZ")
+          echo "test_start_time=$test_start_time" >> $GITHUB_OUTPUT
 
       - name: Set CLI context
         run: astro context switch ${{ steps.get-astro-env-info.outputs.astronomer_host }}
@@ -818,7 +821,8 @@ jobs:
           fi
 
           updated_at=$(date -u -d "${{ steps.get-dbt-bundle-info.outputs.updated_at }}" +"%s.%N")
-          if [[ $(echo "$updated_at > ${{ steps.setup.outputs.test_start_time }}" | bc -l) ]]; then
+          test_start_time=$(date -u -d "${{ steps.setup.outputs.test_start_time }}" +"%s.%N")
+          if [[ $(echo "$updated_at > $test_start_time" | bc -l) ]]; then
             echo "DBT Deploy Action validation succeeded: DBT bundle found"
             exit 0
           fi