diff --git a/.gitea/workflows/build_and_run.yml b/.gitea/workflows/build_and_run.yml
new file mode 100644
index 0000000..5f85ca0
--- /dev/null
+++ b/.gitea/workflows/build_and_run.yml
@@ -0,0 +1,24 @@
+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, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]
+    runs-on: alpine
+    steps:
+      - name: Install dependencies
+        run: apk add git rust cargo
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Run challenge
+        run: |
+          cd day${{ matrix.day_number }}
+          cargo run --release ./input
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index 42f80ae..0000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,130 +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
-
-day-5:
-  stage: build
-  script:
-    - cd day5; cargo run --release ./input
-
-day-6:
-  stage: build
-  script:
-    - cd day6; cargo run --release ./input
-
-day-7:
-  stage: build
-  script:
-    - cd day7; cargo run --release ./input
-
-day-8:
-  stage: build
-  script:
-    - cd day8; cargo run --release ./input
-
-day-9:
-  stage: build
-  script:
-    - cd day9; cargo run --release ./input
-
-day-10:
-  stage: build
-  script:
-    - cd day10; cargo run --release ./input
-
-day-11:
-  stage: build
-  script:
-    - cd day11; cargo run --release ./input
-
-day-12:
-  stage: build
-  script:
-    - cd day12; cargo run --release ./input
-
-day-13:
-  stage: build
-  script:
-    - cd day13; cargo run --release ./input
-
-day-14:
-  stage: build
-  script:
-    - cd day14; cargo run --release ./input
-
-day-15:
-  stage: build
-  script:
-    - cd day15; cargo run --release ./input
-
-day-16:
-  stage: build
-  script:
-    - cd day16; cargo run --release ./input
-
-day-17:
-  stage: build
-  script:
-    - cd day17; cargo run --release ./input
-
-day-18:
-  stage: build
-  script:
-    - cd day18; cargo run --release ./input
-
-day-19:
-  stage: build
-  script:
-    - cd day19; cargo run --release ./input
-
-day-20:
-  stage: build
-  script:
-    - cd day20; cargo run --release ./input
-
-day-21:
-  stage: build
-  script:
-    - cd day21; cargo run --release ./input
-
-day-22:
-  stage: build
-  script:
-    - cd day22; cargo run --release ./input
-
-day-23:
-  stage: build
-  script:
-    - cd day23; cargo run --release ./input
-
-day-24:
-  stage: build
-  script:
-    - cd day24; cargo run --release ./input
-
-day-25:
-  stage: build
-  script:
-    - cd day25; cargo run --release ./input