chore: fix "Github" typo to "GitHub" in scripts and docs

Corrects multiple instances of "Github" to "GitHub" in shell scripts,
workflow YAML files, and documentation. This improves consistency and
accuracy in references to GitHub Actions across the project.

Author: mkoura

.github/node_upgrade.sh

@@ -74,7 +74,7 @@ printf "start: %(%H:%M:%S)T\n" -1
 # update cardano-node to specified revision
 # If BASE_TAR_URL is set, instead of using nix, download and extract binaries for base revision
 # from a published tarball to save disk space, and use the same nix env as will be used for
-# UPGRADE_REVISION. We are running out of space on Github Actions runners.
+# UPGRADE_REVISION. We are running out of space on GitHub Actions runners.
 if [[ -z "${BASE_TAR_URL:-""}" && -n "${BASE_REVISION:-""}" ]]; then
   NODE_OVERRIDE=$(node_override "${BASE_REVISION}")
 elif [ -n "${UPGRADE_REVISION:-""}" ]; then
@@ -174,7 +174,7 @@ fi
 
 _cleanup
 
-# prepare artifacts for upload in Github Actions
+# prepare artifacts for upload in GitHub Actions
 if [ -n "${GITHUB_ACTIONS:-""}" ]; then
   # save testing artifacts
   ./.github/save_artifacts.sh

.github/regression.sh

@@ -252,7 +252,7 @@ fi
 
 _cleanup
 
-# prepare artifacts for upload in Github Actions
+# prepare artifacts for upload in GitHub Actions
 if [ -n "${GITHUB_ACTIONS:-""}" ]; then
 
   # move reports to root dir

.github/workflows/regression_reusable.yaml

@@ -173,7 +173,7 @@ jobs:
           password: ${{secrets.GMAIL_PASSWORD}}
           subject: "Status: ${{ steps.testing-step.outcome }}; workflow: ${{ github.workflow }}"
           to: ${{secrets.CI_FAIL_MAILS}}
-          from: Cardano Github Actions
+          from: Cardano GitHub Actions
           body: "Run URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
           reply_to: [email protected]
           attachments: testrun-report.html

.github/workflows/upgrade_reusable.yaml

@@ -110,7 +110,7 @@ jobs:
           password: ${{secrets.GMAIL_PASSWORD}}
           subject: "Status: ${{ steps.testing-step.outcome }}; workflow: ${{ github.workflow }}"
           to: ${{secrets.CI_FAIL_MAILS}}
-          from: Cardano Github Actions
+          from: Cardano GitHub Actions
           body: "Run URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
           reply_to: [email protected]
           attachments: testrun-report.html

src_docs/source/test_results/nightly_system_tests.rst

@@ -18,7 +18,7 @@ Test statuses
 Nightly results
 ---------------
 
-`Results on Github Actions <https://github.com/IntersectMBO/cardano-node-tests/actions?query=workflow%3A%22Nightly+tests%22+event%3Aschedule+branch%3Amaster++>`__
+`Results on GitHub Actions <https://github.com/IntersectMBO/cardano-node-tests/actions?query=workflow%3A%22Nightly+tests%22+event%3Aschedule+branch%3Amaster++>`__
 
 * `nightly <https://cardano-tests-reports-3-74-115-22.nip.io/cardano-node-tests-nightly/>`__:  |nightly-badge|
    * network in Conway era