Drop bootstack-actions in CI func tests

Using master branch for zaza with TEST_JUJU3=1 [1] and dropping
bootstack-actions for func in CI to be able to use specific lxd
channel.

---
[1]:
openstack-charmers/zaza@af7eea9

.github/workflows/check.yaml

@@ -22,19 +22,29 @@ jobs:
       working-directory: ./src
 
   func:
-    uses: canonical/bootstack-actions/.github/workflows/func.yaml@v2
+    name: Functional tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
     needs: lint-unit
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - juju-channel: "3.1/stable"
-            command: "make functional"
-    with:
-      command: ${{ matrix.command }}
-      juju-channel: ${{ matrix.juju-channel }}
-      nested-containers: false
-      provider: "lxd"
-      python-version: "3.10"
-      timeout-minutes: 120
-      tox-version: "<4"
+        juju-channel: ['3.4/stable']
+        command: ['TEST_JUJU3=1 make functional']  # using TEST_JUJU3 due https://github.com/openstack-charmers/zaza/commit/af7eea953dd5d74d3d074fe67b5765dca3911ca6
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+      - name: Setup Juju ${{ matrix.juju-channel }} LXD environment
+        uses: charmed-kubernetes/actions-operator@main
+        with:
+          provider: lxd
+          juju-channel: ${{ matrix.juju-channel }}
+      - name: Show juju information
+        run: |
+          juju version
+          juju controllers | grep Version -A 1 | awk '{print $9}'
+      - name: Run functional test
+        run: ${{ matrix.command }}

src/tests/functional/requirements.txt

@@ -1,4 +1,4 @@
 flake8
 mock
-git+https://github.com/openstack-charmers/zaza.git@libjuju-3.1#egg=zaza
+git+https://github.com/openstack-charmers/zaza.git#egg=zaza
 python-openstackclient

src/tox.ini

@@ -22,6 +22,7 @@ passenv =
   SNAP_HTTP_PROXY
   SNAP_HTTPS_PROXY
   OS_*
+  TEST_*
 
 [testenv:lint]
 commands =
@@ -76,4 +77,5 @@ deps = -r{toxinidir}/tests/unit/requirements.txt
 [testenv:func]
 changedir = {toxinidir}/tests/functional
 commands = functest-run-suite {posargs:--keep-faulty-model}
-deps = -r {toxinidir}/tests/functional/requirements.txt
+deps =
+  -r {toxinidir}/tests/functional/requirements.txt