Provide aggregator args on deployment (#2011)

# Motivation
The aggregator takes init args. These are optional but must still be
given if deployed by proposal, not if deployed directly.

# Changes
- Create default arguments when creating a proposal template. These may
be edited by a user if they wish, like everything in the template.
- Provide the arguments when deploying an SNS.

# Tests
This has been used for a deployment to production.

---------

Co-authored-by: Max Murphy-Skvorzov <[email protected]>

scripts/sns/aggregator/release

@@ -21,7 +21,11 @@ AGGREGATOR_CANISTER_ID="3r4gx-wqaaa-aaaaq-aaaia-cai"
 WASM="./release/docker/sns_aggregator.wasm"
 SHA="$(sha256sum <"$WASM" | awk '{print $1}')"
 
-set ic-admin --pin "$DFX_HSM_PIN" --nns-url https://ic0.app --use-hsm --key-id 01 --slot 0 propose-to-change-nns-canister --proposer "$NEURON" --canister-id "$AGGREGATOR_CANISTER_ID" --mode upgrade --wasm-module-path "$WASM" --summary-file ./release/AGGREGATOR_PROPOSAL.md --wasm-module-sha256 "$SHA"
+ARG_DID="./release/arg.did"
+ARG_PATH="./release/arg.bin"
+didc encode "$(cat "$ARG_DID")" | xxd -r -p >"$ARG_PATH"
+
+set ic-admin --pin "$DFX_HSM_PIN" --nns-url https://ic0.app --use-hsm --key-id 01 --slot 0 propose-to-change-nns-canister --proposer "$NEURON" --canister-id "$AGGREGATOR_CANISTER_ID" --mode upgrade --wasm-module-path "$WASM" --summary-file ./release/AGGREGATOR_PROPOSAL.md --wasm-module-sha256 "$SHA" --arg "$ARG_PATH"
 
 echo
 echo PLEASE REVIEW THIS COMMAND:

scripts/sns/aggregator/release-template

@@ -59,3 +59,6 @@ git checkout "$(git rev-parse HEAD)"
 sha256sum sns_aggregator.wasm
 \`\`\`
 EOF
+
+ARG_DID="./release/arg.did"
+echo '(record{})' >"$ARG_DID"