Add random number generator script + GitHub Actions workflow

.github/workflows/update.yml

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+name: update
+
+on:
+  schedule:
+    # Run daily at 04:20 UTC.
+    - cron: '20 4 * * *'
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+          token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+      - name: Update
+        run: |
+          ./update.sh
+          git config user.name 'TibiaMaps.io lottery bot'
+          git config user.email 'lottery@tibiamaps.io'
+          date=$(date +'%Y-%m-%d')
+          git add data
+          git commit data -m "Add random numbers for date=${date}" || true
+          git push

rng.py

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+#!/usr/bin/env python3
+
+import sys
+from secrets import randbelow
+
+# Print to stderr.
+def eprint(*args, **kwargs):
+  print(*args, file=sys.stderr, **kwargs)
+
+# Generate a cryptographically strong random number from `min`
+# (inclusive) to `max` (inclusive).
+def rand(min, max):
+  delta = max - min
+  result = min + randbelow(delta + 1)
+  return result
+
+def main():
+  min = int(sys.argv[1])
+  max = int(sys.argv[2])
+  result = rand(min, max)
+  eprint('min=%d; max=%d; result=%d' % (min, max, result))
+  print(result)
+
+main()

update.sh

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+#!/usr/bin/env bash
+
+pubDate=$(date +'%Y-%m-%d');
+(printf "${pubDate}: "; ./rng.py 1   5) >> data/from-01-to-05.txt;
+(printf "${pubDate}: "; ./rng.py 1  10) >> data/from-01-to-10.txt;
+(printf "${pubDate}: "; ./rng.py 1  15) >> data/from-01-to-15.txt;
+(printf "${pubDate}: "; ./rng.py 1  20) >> data/from-01-to-20.txt;
+(printf "${pubDate}: "; ./rng.py 1  25) >> data/from-01-to-25.txt;
+(printf "${pubDate}: "; ./rng.py 1  30) >> data/from-01-to-30.txt;
+(printf "${pubDate}: "; ./rng.py 1  35) >> data/from-01-to-35.txt;
+(printf "${pubDate}: "; ./rng.py 1  40) >> data/from-01-to-40.txt;
+(printf "${pubDate}: "; ./rng.py 1  45) >> data/from-01-to-45.txt;
+(printf "${pubDate}: "; ./rng.py 1  50) >> data/from-01-to-50.txt;
+(printf "${pubDate}: "; ./rng.py 1  55) >> data/from-01-to-55.txt;
+(printf "${pubDate}: "; ./rng.py 1  60) >> data/from-01-to-60.txt;
+(printf "${pubDate}: "; ./rng.py 1  65) >> data/from-01-to-65.txt;
+(printf "${pubDate}: "; ./rng.py 1  70) >> data/from-01-to-70.txt;
+(printf "${pubDate}: "; ./rng.py 1  75) >> data/from-01-to-75.txt;
+(printf "${pubDate}: "; ./rng.py 1  80) >> data/from-01-to-80.txt;
+(printf "${pubDate}: "; ./rng.py 1  85) >> data/from-01-to-85.txt;
+(printf "${pubDate}: "; ./rng.py 1  90) >> data/from-01-to-90.txt;
+(printf "${pubDate}: "; ./rng.py 1  95) >> data/from-01-to-95.txt;
+(printf "${pubDate}: "; ./rng.py 1 100) >> data/from-01-to-100.txt;