feat: add build workflows

- enable fetch-depth for code_checkout
- fetch master branch before checking for changed files
- ensure the clean target is called with the default

.gitea/workflows/build.yaml

@@ -16,6 +16,10 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Fetch master branch
+        run: |
+          git fetch origin master:master
+
       - name: Show changed files
         run: |
           git diff --name-only master

.gitea/workflows/deploy.yaml

@@ -25,6 +25,10 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Fetch master branch
+        run: |
+          git fetch origin master:master
+
       - name: Run Packer Builds
         env:
           VAULT_ROLEID: ${{ secrets.PACKER_BUILDER_VAULT_ROLEID }}