Add Dropbox action

actions/dropbox/README.md

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+# Dropbox
+
+This action can be used in the following manner:
+
+```yaml
+jobs:
+  chktex:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: paddyroddy/.github/actions/[email protected]
+        with:
+          files-to-upload: "example.pdf"
+```
+
+where `x.y.z` is the `major.minor.patch` version of the action.

actions/dropbox/actions.yml

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+name: Dropbox
+description: Upload files to Dropbox
+
+inputs:
+  files-to-upload:
+    description: A list of files to upload to dropbox
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: checkout source
+      uses: actions/checkout@v4
+
+    - name: Set up Dropbox
+      run: |
+        echo "CONFIGFILE_VERSION=$CONFIGFILE_VERSION" > ~/.dropbox_uploader
+        echo "OAUTH_APP_KEY=$OAUTH_APP_KEY" >> ~/.dropbox_uploader
+        echo "OAUTH_APP_SECRET=$OAUTH_APP_SECRET" >> ~/.dropbox_uploader
+        echo "OAUTH_REFRESH_TOKEN=$OAUTH_REFRESH_TOKEN" >> ~/.dropbox_uploader
+      env:
+        CONFIGFILE_VERSION: ${{secrets.CONFIGFILE_VERSION}}
+        OAUTH_APP_KEY: ${{secrets.OAUTH_APP_KEY}}
+        OAUTH_APP_SECRET: ${{secrets.OAUTH_APP_SECRET}}
+        OAUTH_REFRESH_TOKEN: ${{secrets.OAUTH_REFRESH_TOKEN}}
+
+    - name: Retrieve Dropbox uploader script
+      run: |
+        curl "https://raw.githubusercontent.com/andreafabrizi/\
+        Dropbox-Uploader/master/dropbox_uploader.sh" \
+        -o dropbox_uploader.sh
+        chmod +x dropbox_uploader.sh
+
+    - name: Upload PDF
+      run: |
+        for file in ${{ inputs.files-to-upload }}; do \
+        echo $file; \
+        ./dropbox_uploader.sh upload $file $file; \
+        done