Upgrades to containerd, fix deprecations upstream

* Fixes upstream deprecations for containerd
* Fixes deprecations in ioutil package usage
* Break out separate files for function handlers
* Upgrades containerd to 1.7.22
* Fixes default namespace functionality
* Pre-deploy checks as per license agreement
* Removes extra log messages for payload in HTTP handlers, you
can enable FAAS_DEBUG=1 in the CLI instead to see this from
the client's perspective
* Add additional Google DNS server 8.8.4.4 for functions

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

.github/workflows/build.yaml

@@ -16,7 +16,7 @@ jobs:
         with:
           fetch-depth: 1
       - name: Install Go
-        uses: actions/setup-go@v5.0.0
+        uses: actions/setup-go@v5
         with:
           go-version: 1.22.x
 

.github/workflows/publish.yaml

@@ -13,7 +13,7 @@ jobs:
         with:
           fetch-depth: 1
       - name: Install Go
-        uses: actions/setup-go@v5.0.0
+        uses: actions/setup-go@v5
         with:
           go-version: 1.22.x
       - name: Make publish

.github/workflows/verify-images.yaml

@@ -15,4 +15,4 @@ jobs:
       - name: Verify chart images
         id: verify_images
         run: |
-          VERBOSE=true make verify-compose
+          VERBOSE=true make verify-compose