make entrypoint optional

.gitea/workflows/tests.yml

@@ -21,7 +21,7 @@ jobs:
           image: debian:11-slim
           volumes: /tmp/:/tmp/
           options: -e TESTENV=${{ gitea.workspace }}
-          run: echo "test"
+          run: env; echo "test"
 
       - name: multi-line options
         uses: https://git.44net.ch/actions/docker-run-action@main
@@ -35,5 +35,6 @@ jobs:
             -e TESTENV=${{ gitea.workspace }}
             -e TESTENV2=TESTENV2
           run: >-
+            env;
             sh -c
-            echo "test
+            echo "test"

action.yml

@@ -28,10 +28,9 @@ inputs:
     description: "Command(s) to run in the container"
     required: false
 
-  shell:
+  entrypoint:
-    description: "Shell to use"
+    description: "Entrypoint for the container"
     required: false
-    default: sh
 
   registry:
     description: "Container registry URL"

entrypoint.sh

@@ -28,6 +28,11 @@ if [ "${INPUT_MOUNT_SOCKET,,}" == "true" ]; then
     RUNTIME_OPTIONS+=(--volume "/var/run/docker.sock:/var/run/docker.sock")
 fi
 
+# set entrypoint
+if [ "${INPUT_ENTRYPOINT,,}" == "true" ]; then
+    RUNTIME_OPTIONS+=(--entrypoint="${INPUT_ENTRYPOINT}")
+fi
+
 # map volumes
 mapfile -t -d ' ' TMP_VOLUMES < <(printf -- '%s' "${INPUT_VOLUMES}")
 for vol in "${TMP_VOLUMES[@]}"; do
@@ -49,7 +54,6 @@ done
 exec docker run \
     --volume "${INPUT_WORKDIR}:${INPUT_WORKDIR}" \
     --workdir "${INPUT_WORKDIR}" \
-    --entrypoint="${INPUT_SHELL}" \
     --env-file "/docker-run-action.env" \
     "${RUNTIME_OPTIONS[@]}" \
     "${CUSTOM_OPTIONS[@]}" \