Initial setup of gitea actions

.gitea/actions/setup-env/action.yml

@@ -0,0 +1,24 @@
+name: Setup Environment
+description: Prepare the environment for A13labs CI/CD pipelines
+outputs:
+  changed_files:
+    description: The list of changed files in the current pull request
+    value: ${{ steps.get_changed_files.outputs.changed_files }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Get changed files
+      id: get_changed_files
+      shell: bash
+      run: |
+        CHANGED_FILES=$(git diff --name-only ${{ gitea.event.before }} ${{ gitea.sha }})
+        echo "changed_files=$CHANGED_FILES" >> $GITEA_OUTPUT
+
+    - name: Setup Sectool
+      uses: ./.gitea/actions/setup-sectool
+
+    - name: Install Python packages
+      shell: bash
+      run: |
+        python3 -m pip install --upgrade pip