ci: cache Firebird server downloads between runs

- Modify Prepare() to skip download/extract when Firebird is already cached
- Remove directory deletion from Cleanup() (CI runners are ephemeral)
- Add actions/cache step keyed by Firebird version
- Saves download and extraction time on cache hits

Author: fdcastel

.github/workflows/ci.yml

@@ -74,6 +74,12 @@ jobs:
           name: test-binaries
           path: '.\\src\\'
 
+      - name: Firebird Cache
+        uses: actions/cache@v4
+        with:
+          path: 'C:\firebird'
+          key: firebird-${{ matrix.FIREBIRD_SELECTION }}
+
       - name: Tests
         run: |
           try {

tests.ps1

@@ -47,21 +47,36 @@ function Prepare() {
 	$selectedConfiguration = $FirebirdConfiguration[$FirebirdSelection]
 	$fbDownload = $selectedConfiguration.Download
 	$fbDownloadName = $fbDownload -Replace '.+/(.+)$','$1'
-	if (Test-Path $firebirdDir) {
-		rm -Force -Recurse $firebirdDir
+
+	if (Test-Path "$firebirdDir\firebird.exe") {
+		echo "Using cached Firebird from $firebirdDir"
+	}
+	else {
+		if (Test-Path $firebirdDir) {
+			rm -Force -Recurse $firebirdDir
+		}
+		mkdir $firebirdDir | Out-Null
+
+		pushd $firebirdDir
+		try {
+			echo "Downloading $fbDownload"
+			Invoke-RestMethod -Uri $fbDownload -OutFile $fbDownloadName
+			echo "Extracting $fbDownloadName"
+			7z x -bsp0 -bso0 $fbDownloadName
+			rm $fbDownloadName
+		}
+		finally {
+			popd
+		}
 	}
-	mkdir $firebirdDir | Out-Null
+
+	cp -Recurse -Force $firebirdDir\* $testsProviderDir
 
 	pushd $firebirdDir
 	try {
-		echo "Downloading $fbDownload"
-		Invoke-RestMethod -Uri $fbDownload -OutFile $fbDownloadName 
-		echo "Extracting $fbDownloadName"
-		7z x -bsp0 -bso0 $fbDownloadName
-		rm $fbDownloadName
-		cp -Recurse -Force .\* $testsProviderDir
-
-		ni firebird.log -ItemType File | Out-Null
+		if (-not (Test-Path firebird.log)) {
+			ni firebird.log -ItemType File | Out-Null
+		}
 
 		echo "Starting Firebird"
 		$process = Start-Process -FilePath $selectedConfiguration.Executable -ArgumentList $selectedConfiguration.Args -PassThru
@@ -88,7 +103,6 @@ function Cleanup() {
 		# give OS time to release all files
 		sleep -Milliseconds 100
 	}
-	rm -Force -Recurse $firebirdDir
 
 	Write-Host "=== END ==="
 }