#4 : Implement Attach artifact to a release action

+ basic skeleton added

attach/action.yaml

@@ -0,0 +1,24 @@
+name: attach artefact to release
+description: attach file to an existing release in gitea
+
+inputs:
+  release:
+    description: release id
+    required: true
+  file:
+    description: file name to attach
+    required: true
+  name:
+    description: artefact name override
+    required: false
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      env:
+        $NAME: ${{ inputs.name }}
+      run: |
+        name="${$NAME:-${{ inputs.file }}}"
+        curl --fail-with-body -X POST -H "Authorization: token ${ACTI_BOT_TOKEN}" -F "attachment=@${{ inputs.file }}" \
+          ${{ gitea.api_url }}/repos/${{ gitea.repository }}/releases/${{ inputs.release }}/assets?name=${name}