Remove duplicates and add GitHub action to lint collection-index.yml

Author: AlvaroRausell

.github/workflows/lint.yml

@@ -0,0 +1,22 @@
+name: 'Lint collection-index.yml'
+on:
+  pull_request:
+    paths:
+      - _data/collection-index.yml
+
+
+jobs:
+  yamllint:
+    name: 'Yamllint'
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'Checkout'
+        uses: actions/checkout@master
+      - name: 'Yamllint'
+        uses: karancode/yamllint-github-action@master
+        with:
+          yamllint_file_or_dir: _data/collection-index.yml
+          yamllint_strict: true
+          yamllint_comment: true
+        env:
+          GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}

_data/collection-index.yml

@@ -977,7 +977,6 @@
   contact: https://github.com/zetta/devcontainer-features/issues
   repository: https://github.com/zetta/devcontainer-features
   ociReference: ghcr.io/zetta/devcontainer-features
-  ociReference: ghcr.io/davzucky/devcontainers-features-wolfi  
 - name: devcontainer features for ubuntugis
   maintainer: Conner Shoop
   contact: https://github.com/connershoop/devcontainer-feature-ubuntugis/issues
@@ -988,7 +987,6 @@
   contact: https://github.com/The-Nefarious-Developer/devcontainer-templates/issues
   repository: https://github.com/The-Nefarious-Developer/devcontainer-templates
   ociReference: ghcr.io/the-nefarious-developer/devcontainer-templates
-  ociReference: ghcr.io/davzucky/devcontainers-features-wolfi
 - name: Dev Container Features by ForWarD Software
   maintainer: ForWarD Software
   contact: https://github.com/forwardsoftware/devcontainer-features/issues