feat: Add sync functionality

Initial version of the sync functionality

README.md

@@ -1 +1,43 @@
 # salmon-sync
+
+This is a Github Action that syncs a folder to a Google Cloud bucket using `rclone`.
+This action is only meant to work for Deephaven's documentation. It could be used in a more general purpose way to sync a folder into any Google cloud bucket (with the proper credentials), but that is subject to change and may break in any version.
+
+## Parameters
+```
+inputs:
+  source:
+    required: true
+    type: string
+    description: 'The source directory to sync.'
+  destination:
+    required: true
+    type: string
+    description: 'The destination directory to sync. Relative to the bucket. It is recommended to use the GitHub repo path (such as deephaven/salmon-sync) as the minimum base to prevent collisions.'
+  project_number:
+    required: true
+    type: string
+    description: 'The Google Cloud project number.'
+  bucket:
+    required: true
+    type: string
+    description: 'The Google Cloud bucket to sync to.'
+  credentials:
+    required: true
+    type: string
+    description: 'The Google Cloud credentials. Should be base64 encoded.'
+```
+
+## Example
+The action can be used as a step in a workflow
+Here is an example that syncs from the local path `temp/blog` to the blog section of the bucket.
+```
+- name: Sync to the blog
+  uses: deephaven/salmon-sync@v1
+  with:
+    source: temp/blog
+    destination: deephaven/deephaven.io/blog
+    project_number: ${{ secrets.DOCS_GOOGLE_CLOUD_PROJECT_NUMBER}}
+    bucket: ${{ vars.DOCS_GOOGLE_CLOUD_BUCKET }}
+    credentials: ${{ secrets.DOCS_GOOGLE_CLOUD_CREDENTIALS }}
+```

action.yml

@@ -0,0 +1,49 @@
+name: Sync Salmon Directory
+description: Syncs a directory to a Google Cloud bucket using rclone.
+author: 'deephaven'
+inputs:
+  source:
+    required: true
+    type: string
+    description: 'The source directory to sync.'
+  destination:
+    required: true
+    type: string
+    description: 'The destination directory to sync. Relative to the bucket. It is recommended to use the GitHub repo path (such as deephaven/salmon-sync) as the minimum base to prevent collisions.'
+  project_number:
+    required: true
+    type: string
+    description: 'The Google Cloud project number.'
+  bucket:
+    required: true
+    type: string
+    description: 'The Google Cloud bucket to sync to.'
+  credentials:
+    required: true
+    type: string
+    description: 'The Google Cloud credentials. Should be base64 encoded.'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Setup rclone
+      uses: AnimMouse/setup-rclone@v1
+      with:
+        version: v1.68.1
+
+    - name: Decode credentials
+      shell: bash
+      run: |
+        echo $RCLONE_GCS_SERVICE_ACCOUNT_CREDENTIALS_ENCODED | base64 --decode > $HOME/credentials.json
+      env:
+        RCLONE_GCS_SERVICE_ACCOUNT_CREDENTIALS_ENCODED: ${{ inputs.credentials }}
+
+
+    - name: Sync source to destination
+      shell: bash
+      env:
+        RCLONE_CONFIG_GCS_TYPE: "google cloud storage"
+        RCLONE_GCS_SERVICE_ACCOUNT_FILE: $HOME/credentials.json
+        RCLONE_GCS_PROJECT_NUMBER: ${{ inputs.project_number }}
+        RCLONE_GCS_BUCKET_POLICY_ONLY: "true"
+      run: rclone sync ${{ inputs.source }} gcs:${{ inputs.bucket }}/${{ inputs.destination }}