first commit

README.md

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+# mirror@v1

action.yaml

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+inputs:
+  ssh_priv:
+    description: SSH key to push to url
+    required: true
+  known_hosts:
+    description: content of ~/.ssh/known_hosts
+    required: true
+  url:
+    description: push destination
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Checkout
+      run: ${{ gitea.action_path }}/checkout.sh

mirror.sh

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+#!/bin/bash -e
+
+mkdir -p "$HOME/.ssh"
+echo "$INPUT_SSH_PRIV" > "$HOME/.ssh/id_ed25519"
+echo "$INPUT_KNOWN_HOSTS" > "$HOME/.ssh/known_hosts"
+
+git remote set-url --push origin "$INPUT_URL"
+git checkout "$GITHUB_REF_NAME"
+git push origin "$GITHUB_REF_NAME"