feat: moved to gitea workflows for CI/CD

Signed-off-by: Louis Vallat <contact@louis-vallat.dev>

.gitea/workflows/build_and_run.yml

@@ -0,0 +1,22 @@
+name: Build and run challenges
+defaults:
+  run:
+    shell: sh
+on:
+  push:
+
+
+jobs:
+  build-and-run:
+    name: Challenge for day
+    strategy:
+      matrix:
+        day_number: [1, 2, 3, 4]
+    runs-on: rust-bookworm
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Run challenge
+        run: |
+          cd day${{ matrix.day_number }}
+          cargo run --release ./input

.gitlab-ci.yml

@@ -1,25 +0,0 @@
-default:
-  image: rust
-
-stages:
-  - build
-
-day-1:
-  stage: build
-  script:
-    - cd day1; cargo run --release ./input
-
-day-2:
-  stage: build
-  script:
-    - cd day2; cargo run --release ./input
-
-day-3:
-  stage: build
-  script:
-    - cd day3; cargo run --release ./input
-
-day-4:
-  stage: build
-  script:
-    - cd day4; cargo run --release ./input