feat: Add rebrand CI/CD workflows to main branch

- Add 72 rebrand workflow files (polkadot→pezkuwi, substrate→bizinikiwi, cumulus→pezcumulus)
- Add GitHub actions, issue templates, and configs
- Removed unnecessary workflows (fork-sync, gitspiegel, upstream-tracker, sync-templates, backport)
- Renamed zombienet test files to match new naming convention

.github/scripts/release/build-deb.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -e
+
+PRODUCT=$1
+VERSION=$2
+PROFILE=${PROFILE:-production}
+
+cargo install --version 2.7.0 cargo-deb --locked -q
+echo "Using cargo-deb v$(cargo-deb --version)"
+echo "Building a Debian package for '$PRODUCT' in '$PROFILE' profile"
+
+cargo deb --profile $PROFILE --no-strip --no-build -p $PRODUCT --deb-version $VERSION
+
+deb=target/debian/$PRODUCT_*_amd64.deb
+
+cp $deb target/production/