Fix docker host bug (aquasecurity#329)

* Update entrypoint.sh

should be a value not boolean

* Update action.yaml

add example

* Update README.md

README.md

@@ -590,6 +590,7 @@ Following inputs can be used as `step.with` keys:
 | `trivy-config`               | String  |                                    | Path to trivy.yaml config                                                                                                                                      |
 | `github-pat`                 | String  |                                    | Authentication token to enable sending SBOM scan results to GitHub Dependency Graph. Can be either a GitHub Personal Access Token (PAT) or GITHUB_TOKEN        |
 | `limit-severities-for-sarif` | Boolean | false                              | By default *SARIF* format enforces output of all vulnerabilities regardless of configured severities. To override this behavior set this parameter to **true** |
+| `docker-host`                | String  |                                    | By default it is set to `unix://var/run/docker.sock`, but can be updated to help with containerized infrastructure values                                      |
 
 ### Environment variables
 You can use [Trivy environment variables][trivy-env] to set the necessary options (including flags that are not supported by [Inputs](#inputs), such as `--secret-config`).

action.yaml

@@ -95,7 +95,7 @@ inputs:
     description: 'limit severities for SARIF format'
     required: false
   docker-host:
-    description: 'unix domain socket path to use for docker scanning'
+    description: 'unix domain socket path to use for docker scanning, ex. unix:///var/run/docker.sock'
     required: false
 
 runs:
@@ -126,4 +126,4 @@ runs:
     - '-v ${{ inputs.trivy-config }}'
     - '-x ${{ inputs.tf-vars }}'
     - '-z ${{ inputs.limit-severities-for-sarif }}'
-    - '-y ${{ inputs.docker-host }}'
+    - '-y ${{ inputs.docker-host }}'

entrypoint.sh

@@ -168,7 +168,7 @@ if [ "$hideProgress" == "true" ];then
   ARGS="$ARGS --quiet"
   SARIF_ARGS="$SARIF_ARGS --quiet"
 fi
-if [ "$dockerHost" == "true" ];then
+if [ $dockerHost ];then
   ARGS="$ARGS --docker-host $dockerHost"
 fi