ci: automatize PPs generation on major version bumps (#450)

This PR carries over from DQ the script used to generate the PPs, and
adds an action to automatically trigger it when preparing a PR for a
major version bump. The action should be manually runnable as well.

.github/workflows/prepare-release.yml

@@ -33,3 +33,28 @@ jobs:
           crate-release-all: true
           pr-meta-comment: false
           pr-merge-strategy: "squash"
+  public-params:
+    if: inputs.bump == "major"
+    name: Generate & Upload PPs
+    runs-on: ['memory:32GB']
+    environment: CI
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2024-11-09
+      - name: Check aws is installed
+        run: aws --version
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.20' # The Go version to download (if necessary) and use.
+      - name: Generate PPs
+        run: |
+          ulimit -s unlimited
+          cargo run --release --bin gen-params
+      - name: Upload PPs
+        run: aws s3 cp --no-progress --recursive zkmr_params s3://lagrange-public-parameters --endpoint-url=https://428e47101872e479a0c311b576430fac.r2.cloudflarestorage.com
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.CF_AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.CF_AWS_SECRET_ACCESS_KEY }}
+          AWS_DEFAULT_REGION: eeur