diff --git a/Dockerfile b/Dockerfile
index 791df4c..0570c0d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,8 @@
 FROM ghcr.io/hadolint/hadolint:v2.10.0-debian
 
+# Set default WORKDIR in Dockerfile for easier trace and consistency
+WORKDIR /github/workspace
+
 COPY LICENSE README.md problem-matcher.json /
 COPY hadolint.sh /usr/local/bin/hadolint.sh
 
diff --git a/README.md b/README.md
index e2e6b74..95d8e8b 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ steps:
 |----------------------|-----------------------------------------------------------------------------------------------------------------------------------------|--------------------|
 | `dockerfile`         | The path to the Dockerfile to be tested                                                                                                 | `./Dockerfile`     |
 | `recursive`          | Search for specified dockerfile </br> recursively, from the project root                                                                | `false`            |
-| `config`             | Custom path to a Hadolint config file                                                                                                   | `./.hadolint.yaml` |
+| `config`             | Custom path to a Hadolint config file                                                                                                   |                    |
 | `output-file`        | A sub-path where to save the </br> output as a file to                                                                                  |                    |
 | `no-color`           | Don't create colored output (`true`/`false`)                                                                                            |                    |
 | `no-fail`            | Never fail the action (`true`/`false`)                                                                                                  |                    |
diff --git a/hadolint.sh b/hadolint.sh
index cb8503a..f223c06 100755
--- a/hadolint.sh
+++ b/hadolint.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Set essential environment variables in the container
+export {PWD,HOME}=$(pwd)
+
 # The problem-matcher definition must be present in the repository
 # checkout (outside the Docker container running hadolint). We copy
 # problem-matcher.json to the home folder.
@@ -16,7 +19,7 @@ trap cleanup EXIT
 echo "::add-matcher::$HOME/problem-matcher.json"
 
 if [ -n "$HADOLINT_CONFIG" ]; then
-  HADOLINT_CONFIG="-c ${HADOLINT_CONFIG}"
+  HADOLINT_CONFIG="-c ${PWD}/${HADOLINT_CONFIG}"
 fi
 
 if [ -z "$HADOLINT_TRUSTED_REGISTRIES" ]; then