Proposal for Devfile port detection and default ports support (#33)

* Add release version to release.yaml

Signed-off-by: thepetk <thepetk@gmail.com>

* Add .exe extension for windows architecture

Signed-off-by: thepetk <thepetk@gmail.com>

* Create proposal for devfile port and default port detection

Signed-off-by: thepetk <thepetk@gmail.com>

* Update docs/proposals/devfile_and_default_ports_detection.md

Signed-off-by: thepetk <thepetk@gmail.com>

Co-authored-by: Armel Soro <armel@rm3l.org>
Signed-off-by: thepetk <thepetk@gmail.com>

* Clarify type of detected devfile ports

Signed-off-by: thepetk <thepetk@gmail.com>

* Update proposal

Signed-off-by: thepetk <thepetk@gmail.com>

* Update docs/proposals/devfile_and_default_ports_detection.md

Signed-off-by: thepetk <thepetk@gmail.com>

Co-authored-by: Armel Soro <armel@rm3l.org>
Signed-off-by: thepetk <thepetk@gmail.com>

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Signed-off-by: thepetk <thepetk@gmail.com>
Co-authored-by: Armel Soro <armel@rm3l.org>

docs/proposals/devfile_and_default_ports_detection.md

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+# Devfile port detection & default ports
+
+## Related Github Issues
+
+- https://github.com/devfile/api/issues/1154
+
+## Background
+In order to perform port detection component-wise, `alizer` is performing different strategies of port detection per component. Currently, we support 3 different strategies:
+
+* Dockerfile Port Detection
+* Docker Compose Port Detection
+* Source Code Port Detection
+
+At the moment, `alizer` doesn't support port detection from `devfile.y(a)ml` files. This means that all ports defined inside a file like this will not be included in alizer's response. _As a result, the first goal of this proposal is to include the devfiles as part of the port detection algorithm_, exactly like `dockerfile` and `compose`.
+
+On the other hand, right now `alizer` is not returning any default ports of detected frameworks. As a result, for every component using a framework that has default ports, alizer will not include them in its response even if we haven't detected any ports from our strategies (ports list is empty). That said, as a second goal of this proposal, we would like to add a new feature in alizer that will include default ports in alizer's response.
+
+## Devfile Port Detection
+For devfile port detection we should follow the same flow with dockerfile:
+
+1. Create a function that will:
+    * look for a devfile inside a given component (The `utils.GetLocations` function should be updated to support devfiles too).
+    * It will also find all ports defined in `components.kubernetes.endpoints` & `components.container.endpoints`.
+
+```go
+// GetPortsFromDevfile returns a slice of port numbers from Devfile in the given directory.
+func GetPortsFromDevfile(root string) []int {
+	locations := utils.GetLocations(root)
+	for _, location := range locations {
+		…
+            return utils.ReadPortsFromDevfile(file)
+	}
+	return []int{}
+}
+```
+
+2. Create a new `const` inside `model/model.go`:
+```go
+const Devfile PortDetectionAlgorithm = 3
+```
+
+3. Add a new algorithm case to the following enricher DoEnrichComponent functions:
+```
+dotnet_enricher.go
+go_enricher.go
+java_enricher.go
+javascript_enricher.go
+php_enricher.go
+python_enricher.go
+```
+
+Following those steps will add support for devfile port detection for every component that we will be able to detect.
+
+## Default Ports
+In order to support default ports for port detection we will need to complete the following steps:
+
+1. We will need to define a new flag `--add-default-ports` inside the `component` command. This way someone can set that they would like to have a response which will include default ports.
+
+2. For every `framework` that we detect we should investigate if it uses any ports by default. After the investigation every `detector` should have the following function:
+```go
+func (d LaravelDetector) GetDefaultPorts() []string {
+	return []int{8080}
+}
+```
+
+3. Upon `DoPortsDetection` the default ports should be added in the end of the `ports` array in alizer's response:
+
+```json
+// default ports = 3000, 3001
+
+// Case1: Only default ports where returned
+[
+    {
+            "Name": "example-project",
+            "Path": "/path/to/example-project/",
+            "Languages": [...],
+            "Ports": [3000, 3001]
+    }
+]
+
+// Case2: Ports 2001, 2002 are detected for example-project
+[
+    {
+            "Name": "example-project",
+            "Path": "/path/to/example-project/",
+            "Languages": [...],
+            "Ports": [2001, 2002, 3000, 3001]
+    }
+]
+
+```
+
+_In case the `--add-default-ports` is not set the default value will be `false`_