Introduce workdir

README.md

@@ -71,6 +71,17 @@ with:
   dockerfile: MyDockerFileName
 ```
 
+### workdir
+Use `workdir` when you would like to change the directory for building.
+
+```yaml
+with:
+  name: myDocker/repository
+  username: ${{ secrets.DOCKER_USERNAME }}
+  password: ${{ secrets.DOCKER_PASSWORD }}
+  workdir: mySubDirectory
+```
+
 ### cache
 Use `cache` when you have big images, that you would only like to build partially (changed layers).  
 > CAUTION: This will cache the non changed parts forever. If you use this option, make sure that these parts will be updated by another job!

entrypoint.sh

@@ -35,6 +35,10 @@ if [ $(echo ${GITHUB_REF} | sed -e "s/refs\/pull\///g") != ${GITHUB_REF} ]; then
   BRANCH="pr$(echo ${GITHUB_REF} | sed -e "s/refs\/pull\///g" | sed -e "s/\///g")"
 fi;
 
+if [ ! -z "${INPUT_WORKDIR}" ]; then
+  cd "${INPUT_WORKDIR}"
+fi
+
 echo ${INPUT_PASSWORD} | docker login -u ${INPUT_USERNAME} --password-stdin ${INPUT_REGISTRY}
 
 DOCKERNAME="${INPUT_NAME}:${BRANCH}"

test.bats

@@ -256,3 +256,14 @@ Called /usr/local/bin/docker logout"
   [ "$status" -eq 1 ]
   [ "$output" = "$expected" ]
 }
+
+@test "it errors when the working directory is configured but not present" {
+  export INPUT_WORKDIR='mySubDir'
+
+  run /entrypoint.sh
+
+  local expected="/entrypoint.sh: cd: line 39: can't cd to mySubDir: No such file or directory"
+  echo "$output"
+  [ "$status" -eq 2 ]
+  [ "$output" = "$expected" ]
+}