workflows: Do not install docker

The latest ubuntu runners already have docker installed and trying to
install it manually will cause the following issue:
```
Run curl -fsSL https://test.docker.com/ -o test-docker.sh
Warning: the "docker" command appears to already exist on this system.

If you already have Docker installed, this script can cause trouble, which is
why we're displaying this warning and provide the opportunity to cancel the
installation.

If you installed the current Docker package using this script and are using it
again to update Docker, you can safely ignore this message.

You may press Ctrl+C now to abort this script.
+ sleep 20
+ sudo -E sh -c apt-get update -qq >/dev/null
E: The repository 'https://packages.microsoft.com/ubuntu/22.04/prod jammy Release' is no longer signed.
```

Fixes: #6390

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

.github/workflows/deploy-ccv0-demo.yaml

@@ -49,11 +49,6 @@ jobs:
           - shim-v2
     steps:
       - uses: actions/checkout@v2
-      - name: Install docker
-        run: |
-          curl -fsSL https://test.docker.com -o test-docker.sh
-          sh test-docker.sh
-
       - name: Prepare confidential container rootfs
         if: ${{ matrix.asset == 'rootfs-initrd' }}
         run: |

.github/workflows/kata-deploy-push.yaml

@@ -29,12 +29,6 @@ jobs:
           - nydus
     steps:
       - uses: actions/checkout@v2
-      - name: Install docker
-        if: ${{ !contains(github.event.pull_request.labels.*.name, 'force-skip-ci') }}
-        run: |
-          curl -fsSL https://test.docker.com -o test-docker.sh
-          sh test-docker.sh
-
       - name: Build ${{ matrix.asset }}
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'force-skip-ci') }}
         run: |

.github/workflows/kata-deploy-test.yaml

@@ -72,11 +72,6 @@ jobs:
         with:
           ref: ${{ steps.get-PR-ref.outputs.pr-ref }}
 
-      - name: Install docker
-        run: |
-          curl -fsSL https://test.docker.com -o test-docker.sh
-          sh test-docker.sh
-
       - name: Build ${{ matrix.asset }}
         run: |
           make "${KATA_ASSET}-tarball"

.github/workflows/release.yaml

@@ -22,11 +22,6 @@ jobs:
           - virtiofsd
     steps:
       - uses: actions/checkout@v2
-      - name: Install docker
-        run: |
-          curl -fsSL https://test.docker.com -o test-docker.sh
-          sh test-docker.sh
-
       - name: Build ${{ matrix.asset }}
         run: |
           ./tools/packaging/kata-deploy/local-build/kata-deploy-copy-yq-installer.sh