Add Docker image removal option

README.md

@@ -32,6 +32,7 @@ jobs:
         dotnet: true
         haskell: true
         large-packages: true
+        docker-images: true
         swap-storage: true
 ```
 ## Options
@@ -49,6 +50,7 @@ Here are a few sources of inspiration:
 - https://github.com/apache/flink/blob/master/tools/azure-pipelines/free_disk_space.sh
 - https://github.com/ShubhamTatvamasi/free-disk-space-action
 - https://github.com/actions/virtual-environments/issues/2875#issuecomment-1163392159
+- https://github.com/easimon/maximize-build-space/
 
 ## Typical Output
 
@@ -1638,4 +1640,4 @@ overall:
 ********************************************************************************
 => Saved 31GiB
 ********************************************************************************
-```
+```

action.yml

@@ -27,6 +27,11 @@ inputs:
     required: false
     default: "true"
 
+  docker-images:
+    description: "Remove Docker images"
+    required: false
+    default: "true"
+
   # option inspired by:
   # https://github.com/actions/virtual-environments/issues/2875#issuecomment-1163392159
   tool-cache:
@@ -180,6 +185,18 @@ runs:
           printSavedSpace $SAVED "Large misc. packages"
         fi
 
+        # Option: Remove Docker images
+
+        if [[ ${{ inputs.docker-images }} == 'true' ]]; then
+          BEFORE=$(getAvailableSpace)
+
+          sudo docker image prune --all --force
+
+          AFTER=$(getAvailableSpace)
+          SAVED=$((AFTER-BEFORE))
+          printSavedSpace $SAVED "Docker images"
+        fi
+
         # Option: Remove tool cache
         # REF: https://github.com/actions/virtual-environments/issues/2875#issuecomment-1163392159