internal/ci: revert the use of Namespace volume caching

Until we have figured out why the setup-python step does not work
when Namespace's volume-based caching kicks in.
See: actions/setup-python#1244

Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: Ia255ab21bedbb9884e051edc2ff9e52899070311
Dispatch-Trailer: {"type":"trybot","CL":1226689,"patchset":2,"ref":"refs/changes/89/1226689/2","targetBranch":"main"}

Author: mvdan

.github/workflows/trybot.yaml

@@ -95,14 +95,6 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           cache: pip
-      - if: github.event_name != 'schedule' && matrix.runner != 'ns-windows-amd64'
-        uses: namespacelabs/nscloud-cache-action@v1
-        with:
-          cache: go
-      - if: |-
-          github.repository == 'cue-lang/cue-py' && (((github.ref == 'refs/heads/main') && (! (contains(github.event.head_commit.message, '
-          Dispatch-Trailer: {"type":"')))) || (github.ref == 'refs/heads/ci/test'))
-        run: go env -w GOFLAGS=-count=1
       - name: pip install
         run: pip install -r requirements.txt
       - name: Checkout libcue

internal/ci/github/trybot.cue

@@ -66,7 +66,8 @@ workflows: trybot: _repo.bashWorkflow & {
 				// cachePre must come after installing Go,
 				// because the cache locations
 				// are established by running each tool.
-				for v in _repo.setupCaches {v},
+				// TODO(mvdan): re-enable once https://github.com/actions/setup-python/issues/1244 is resolved.
+				// for v in _repo.setupCaches {v},
 
 				_runPip,