Merge pull request #4 from plexsystems/update-version

chore: Update container structure test to v1.15.0

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.17
 
-ARG CST_VERSION=1.14.0
+ARG CST_VERSION=1.15.0
 RUN apk add --no-cache curl \
     && curl -sSL https://storage.googleapis.com/container-structure-test/v${CST_VERSION}/container-structure-test-linux-amd64 -o /usr/local/bin/container-structure-test \
     && chmod +x /usr/local/bin/container-structure-test \

README.md

@@ -1,7 +1,5 @@
 # container-structure-test-action
 
-![Build Status](https://github.com/plexsystems/container-structure-test-action/workflows/build-test/badge.svg)
-
 Setup [container-structure-test](https://github.com/GoogleContainerTools/container-structure-test) for use in your [GitHub Action](https://github.com/features/actions) workflows.
 
 ## Required inputs
@@ -20,11 +18,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: checkout source
-      uses: actions/checkout@master
+      uses: actions/checkout@main
 
     - name: run structure tests
       uses: plexsystems/[email protected]
       with:
         image: my-image:latest
         config: tests.yaml
-```
+```