Add placeholder workflows to faciliate development in a branch

The objective is to split up the workflows, which requires the existence
of the *new* workflow files in the master branch in order to trigger
test builds in a branch.

.github/workflows/build_docs.yaml

@@ -0,0 +1,22 @@
+# LICENSE BEGIN
+# This file is part of the SixtyFPS Project -- https://sixtyfps.io
+# Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
+# Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+# This file is also available under commercial licensing terms.
+# Please contact info@sixtyfps.io for more information.
+# LICENSE END
+# Build various demo binaries, c++ packages and documentation and publish them on the website
+name: Build docs
+
+on:
+  workflow_dispatch:
+  workflow_call:
+
+jobs:
+  docs:
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Dummy
+      run: echo ok

.github/workflows/nightly_snapshot.yaml

@@ -0,0 +1,22 @@
+# LICENSE BEGIN
+# This file is part of the SixtyFPS Project -- https://sixtyfps.io
+# Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
+# Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+# This file is also available under commercial licensing terms.
+# Please contact info@sixtyfps.io for more information.
+# LICENSE END
+# Build various demo binaries, c++ packages and documentation and publish them on the website
+name: Nightly snapshot
+
+on:
+  workflow_dispatch:
+
+jobs:
+
+  publish:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Dummy
+        run: echo ok

.github/workflows/wasm_demos.yaml

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+# LICENSE BEGIN
+# This file is part of the SixtyFPS Project -- https://sixtyfps.io
+# Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
+# Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+# This file is also available under commercial licensing terms.
+# Please contact info@sixtyfps.io for more information.
+# LICENSE END
+name: Build wasm demos
+
+on:
+  workflow_dispatch:
+  workflow_call:
+
+jobs:
+  wasm_demo:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Dummy
+        run: echo ok

.github/workflows/wasm_editor_and_interpreter.yaml

@@ -0,0 +1,21 @@
+# LICENSE BEGIN
+# This file is part of the SixtyFPS Project -- https://sixtyfps.io
+# Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
+# Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+# This file is also available under commercial licensing terms.
+# Please contact info@sixtyfps.io for more information.
+# LICENSE END
+name: Build the web editor and the interpreter wasm module
+
+on:
+  workflow_dispatch:
+  workflow_call:
+
+jobs:
+  wasm:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Dummy
+        run: echo ok