ci: use remote mage-ci action

.forgejo/actions/mage/Dockerfile

@@ -1,6 +0,0 @@
-# syntax=docker/dockerfile:1
-FROM golang:1.23.0
-
-RUN go install github.com/magefile/mage@v1.15.0
-
-ENTRYPOINT ["mage"]

.forgejo/actions/mage/action.yaml

@@ -1,16 +0,0 @@
----
-name: "Mage Action"
-description: "Runs a mage target in the defined in the project's repository"
-
-inputs:
-  target:
-    description: "The mage target to run"
-    required: true
-
-runs:
-  using: "docker"
-  image: "Dockerfile"
-  entrypoint: "mage"
-  args:
-  - -v
-  - ${{ inputs.target }}

.forgejo/workflows/Tests.yaml

@@ -15,7 +15,7 @@ jobs:
     - name: Checkout Repository
       uses: https://code.forgejo.org/actions/checkout@v4
     - name: Test
-      uses: ./.forgejo/actions/mage
+      uses: https://codeflow.dananglin.me.uk/actions/mage-ci@main
       with:
         target: test
       env: