diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
new file mode 100644
index 00000000..3d955919
--- /dev/null
+++ b/.github/workflows/main.yaml
@@ -0,0 +1,51 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "feature/lab3"
+  workflow_dispatch:
+
+jobs:
+  basic:
+    name: Basic CI info + system details
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Print workflow/run context
+        run: |
+          echo "Event: ${{ github.event_name }}"
+          echo "Repository: ${{ github.repository }}"
+          echo "Actor: ${{ github.actor }}"
+          echo "Ref: ${{ github.ref }}"
+          echo "SHA: ${{ github.sha }}"
+          echo "Run ID: ${{ github.run_id }}"
+          echo "Run number: ${{ github.run_number }}"
+          echo "Runner OS: ${{ runner.os }}"
+          echo "Runner Arch: ${{ runner.arch }}"
+          echo "Runner Name: ${{ runner.name }}"
+
+      - name: System information (OS/CPU/RAM/Disk)
+        shell: bash
+        run: |
+          set -euxo pipefail
+          echo "=== OS Release ==="
+          cat /etc/os-release || true
+
+          echo "=== Kernel ==="
+          uname -a
+
+          echo "=== CPU ==="
+          lscpu || true
+
+          echo "=== Memory ==="
+          free -h || true
+
+          echo "=== Disk ==="
+          df -h || true
+
+          echo "=== Top processes (optional) ==="
+          ps aux --sort=-%mem | head -n 10 || true
\ No newline at end of file
diff --git a/labs/submission3.md b/labs/submission3.md
new file mode 100644
index 00000000..e84d8dfc
--- /dev/null
+++ b/labs/submission3.md
@@ -0,0 +1,43 @@
+# Lab 3 — CI/CD with GitHub Actions
+
+## Task 1 — First GitHub Actions Workflow
+
+Key concepts observed:
+- **Workflow**: YAML automation stored in `.github/workflows/`.
+- **Trigger (event)**: `push` automatically starts a run when commits are pushed.
+- **Job**: A group of steps executed on the same runner VM.
+- **Steps**: Individual commands/actions executed sequentially.
+- **Runner**: The machine executing the job (GitHub-hosted runner via `runs-on`).
+
+
+
+
+## Task 2 — Manual Trigger + System Information
+
+
+### `.github/workflows/lab3-ci.yml`:
+
+- Initial setup
+- Manual trigger
+- System information collection
+
+### Gathered System Information from Runner
+
+- Operating System: Ubuntu (ubuntu-latest GitHub-hosted runner)
+- Kernel Version: Linux kernel version displayed via `uname -a`
+- CPU Architecture: x86_64
+- Memory: RAM size and usage displayed via free `-h`
+- Disk Space: Available and used storage displayed via `df -h`
+
+### Comparison of Manual vs Automatic Workflow Triggers
+
+**Automatic Trigger**:
+- Activated automatically when code is pushed to the repository.
+- Event type shown in logs as: `push`.
+- Used for continuous integration to validate changes immediately after commit.
+- Ensures automated testing and validation without manual intervention.
+
+
+**Manual Trigger (`workflow_dispatch`)**:
+- Triggered manually via GitHub UI
+- Event type shown in logs as: `workflow_dispatch`.