chore: check ecobalyse-data sync for PR (#915)

## 🔧 Problem

We have 2 repos `ecobalyse-data` and `ecobalyse` so we have out of sync
issues.

I experienced them and it's quite annoying.

We agreed upon a workflow with the following rules : 
- `ecobalyse-data` PR should be merged first
- Only then can a corresponding syncing`ecobalyse` PR can be merged

With this workflow, `ecobalyse-data/main` should always be sync with
`ecobalyse/branch_a` when doing a PR on `ecobalyse`:

## 🍰 Solution

In every `ecobalyse` PR add a check that verifies if `ecobalyse-data`
and `ecobalyse` are in sync for the generated `ecobalyse-data` files :
- "public/data/food/ingredients.json"
- "public/data/food/processes.json"
- "public/data/textile/materials.json"
- "public/data/textile/processes.json"
- "public/data/object/processes.json"


## 🚨  Points to watch/comments

- As `ecobalyse/master` might be temporarily behind
`ecobalyse-data/main`, this check should not apply in the CI on
`ecobalyse/master`. Only on PR to `ecobalyse/master`

- If someone merge a json-changing PR in `ecobalyse-data` and he doesn't
merge the corresponding PR on `ecobalyse`, then this check is going to
block all `ecobalyse` PR because they will all be out of sync. But
that's kind of the point, it forces us to always sync `ecobalyse-data`
and `ecobalyse`

- I didn't add `public/data/textile/processes_impacts.json` to the check
as it was more complicated with the encryption. Any modification to
`processes_impacts.json` should normally modify `processes.json` so it's
not that important

- Unit testing check-ecobalyse-data-sync.sh would be nice

## 🏝️ How to test


### Success
- running `./check-ecobalyse-data-sync.sh ` should succeed (if this is
sync to `ecobalyse-data`)

### Failure
  - add a difference in one of the generated json (listed above)
- running `./check-ecobalyse-data-sync.sh ` should fail and display the
diff

.github/workflows/ecobalyse-data-sync.yml

@@ -0,0 +1,15 @@
+name: ecobalyse-data sync
+
+on:
+  pull_request:
+    branches: [ master, staging ]
+  workflow_dispatch:
+
+jobs:
+  check-ecobalyse-data-sync:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Check synchronization with ecobalyse-data for generated JSON
+      run: ./bin/check-ecobalyse-data-sync.sh

bin/check-ecobalyse-data-sync.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+set -euo pipefail
+
+# Directory where files will be downloaded
+TEMP_DIR=$(mktemp -d)
+ECOBALYSE_DATA_BRANCH="${ECOBALYSE_DATA_BRANCH:-main}"
+ECOBALYSE_DATA_REPO="${ECOBALYSE_DATA_REPO:-MTES-MCT/ecobalyse-data}"
+RAW_GITHUB_URL="https://raw.githubusercontent.com/${ECOBALYSE_DATA_REPO}/${ECOBALYSE_DATA_BRANCH}"
+DIFFERENCES_FOUND=0
+
+# Cleanup function
+cleanup() {
+    rm -rf "$TEMP_DIR"
+}
+trap cleanup EXIT
+
+# Files to check
+FILES=(
+    "public/data/food/ingredients.json"
+    "public/data/food/processes.json"
+    "public/data/textile/materials.json"
+    "public/data/textile/processes.json"
+    "public/data/object/processes.json"
+)
+
+echo "Downloading files from ecobalyse-data repository (branch: ${ECOBALYSE_DATA_BRANCH})..."
+
+# Create necessary directories in TEMP_DIR
+for file in "${FILES[@]}"; do
+    mkdir -p "$TEMP_DIR/$(dirname "$file")"
+done
+
+# Download each file
+for file in "${FILES[@]}"; do
+    curl -s "$RAW_GITHUB_URL/$file" -o "$TEMP_DIR/$file" || {
+        echo "--⚠️  Failed to download $file from ecobalyse-data repository"
+        continue
+    }
+done
+
+echo "Comparing JSON files between ecobalyse-data and ecobalyse repositories..."
+
+for file in "${FILES[@]}"; do
+    if [ -f "$file" ]; then
+        other_file="$TEMP_DIR/$file"
+
+        if [ -f "$other_file" ]; then
+            # Compare files and store the diff output
+            diff_output=$(diff -u "$file" "$other_file" || true)
+            if [ -n "$diff_output" ]; then
+                echo "--❌ $file is different:"
+                echo "$diff_output"
+                DIFFERENCES_FOUND=1
+            else
+                echo "--✅ $file is synchronized"
+            fi
+        else
+            echo "--⚠️  $file does not exist in ecobalyse-data repository"
+            DIFFERENCES_FOUND=1
+        fi
+    else
+        echo "--⚠️  $file does not exist in ecobalyse repository"
+        DIFFERENCES_FOUND=1
+    fi
+done
+
+if [ $DIFFERENCES_FOUND -eq 1 ]; then
+    echo "❌ Differences found between repositories ecobalyse-data and ecobalyse"
+    exit 1
+else
+    echo "✅ All JSON files are synchronized"
+    exit 0
+fi