ci: add caching for NuGet packages in CI workflows (#522)

Signed-off-by: André Silva <2493377+askpt@users.noreply.github.com>

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## This PR
<!-- add the description of the PR here -->

This pull request enhances the CI/CD workflows by adding caching for
NuGet packages across multiple workflow files. This change aims to
improve build performance by avoiding repeated downloads of
dependencies.

### Workflow Improvements:

*
[`.github/workflows/ci.yml`](diffhunk://#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR39-R46):
Added a step to cache NuGet packages in both the main CI job and another
job within the same file. This uses the `actions/cache` action to store
packages in `~/.nuget/packages` and leverages file hashing for cache
keys.
[[1]](diffhunk://#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR39-R46)
[[2]](diffhunk://#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR82-R89)
*
[`.github/workflows/code-coverage.yml`](diffhunk://#diff-49708f979e226a1e7bd7a68d71b2e91aae8114dd3e9254d9830cd3b4d62d4303R37-R44):
Introduced NuGet package caching to the code coverage workflow,
improving efficiency during the `dotnet test` step.
*
[`.github/workflows/e2e.yml`](diffhunk://#diff-3e103440521ada06efd263ae09b259e5507e4b8f7408308dc227621ad9efa31eR32-R39):
Added caching for NuGet packages in the end-to-end testing workflow,
reducing setup time for dependencies.
*
[`.github/workflows/release.yml`](diffhunk://#diff-87db21a973eed4fef5f32b267aa60fcee5cbdf03c67fafdc2a9b553bb0b15f34R54-R61):
Implemented NuGet package caching in the release workflow to optimize
dependency installation during the `dotnet restore` step.

### Notes
<!-- any additional notes for this PR -->

This is similar to
open-feature/dotnet-sdk-contrib#453

---------

Signed-off-by: André Silva <2493377+askpt@users.noreply.github.com>

Author: askpt

.github/workflows/ci.yml

@@ -36,6 +36,14 @@ jobs:
           global-json-file: global.json
           source-url: https://nuget.pkg.github.com/open-feature/index.json
 
+      - name: Cache NuGet packages
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
       - name: Restore
         run: dotnet restore
 
@@ -71,6 +79,14 @@ jobs:
           global-json-file: global.json
           source-url: https://nuget.pkg.github.com/open-feature/index.json
 
+      - name: Cache NuGet packages
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
       - name: Restore
         run: dotnet restore
 

.github/workflows/code-coverage.yml

@@ -34,6 +34,14 @@ jobs:
           global-json-file: global.json
           source-url: https://nuget.pkg.github.com/open-feature/index.json
 
+      - name: Cache NuGet packages
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
       - name: Run Test
         run: dotnet test --verbosity normal /p:CollectCoverage=true /p:CoverletOutputFormat=opencover
 

.github/workflows/e2e.yml

@@ -29,6 +29,14 @@ jobs:
           global-json-file: global.json
           source-url: https://nuget.pkg.github.com/open-feature/index.json
 
+      - name: Cache NuGet packages
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
       - name: Initialize Tests
         run: |
           git submodule update --init --recursive

.github/workflows/release.yml

@@ -51,6 +51,14 @@ jobs:
           global-json-file: global.json
           source-url: https://nuget.pkg.github.com/open-feature/index.json
 
+      - name: Cache NuGet packages
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
       - name: Install dependencies
         run: dotnet restore