Bugfix/fix condition to pull container (#20)

* Try fixing conditions

* Upgrade download-artifact action

Author: cybcon

.github/workflows/container-vulnerability-scan.yaml

@@ -41,7 +41,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
       - name: Login to DockerHub container registry
-        if: ${{ inputs.login_dockerhub }}
+        if: inputs.login_dockerhub
         uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -50,30 +50,22 @@ jobs:
         run: |
           docker pull aquasec/trivy:${{ inputs.trivy_tag }}
       - name: Download container image from artifacts if uploaded
-        if: ${{ inputs.image_artifact_name }} != null &&
-            ${{ inputs.image_artifact_filename }} != null
-        uses: actions/download-artifact@v2
+        if: inputs.image_artifact_name != '' &&
+            inputs.image_artifact_filename != ''
+        uses: actions/download-artifact@v3.0.2
         with:
           name: ${{ inputs.image_artifact_name }}
           path: /tmp
       - name: Load container image file if one is shipped via artifacts
-        if: ${{ inputs.image_artifact_name }} != null &&
-            ${{ inputs.image_artifact_filename }} != null
+        if: inputs.image_artifact_name != '' &&
+            inputs.image_artifact_filename != ''
         run: |
           docker load --input /tmp/${{ inputs.image_artifact_filename }}
-          RC=$?
-          if [ ${RC} -gt 0 ]; then
-            exit ${RC}
-          fi
       - name: Pull container image that should be scanned if no container image is shipped via artifacts
-        if: ${{ inputs.image_artifact_name }} == null &&
-            ${{ inputs.image_artifact_filename }} == null
+        if: inputs.image_artifact_name == '' ||
+            inputs.image_artifact_filename == ''
         run: |
           docker pull ${{ inputs.image_name }}
-          RC=$?
-          if [ ${RC} -gt 0 ]; then
-            exit ${RC}
-          fi
       - name: List available container images in local repository
         run: |
           docker image ls -a